A catalog with combinations mechanically produces similar content. Fifteen variants of the same model share the description, the characteristics and often the visuals. The question is not to eliminate this similarity, which is normal, but to decide what deserves to exist as an independent page.
The four sources of duplication
Variants accessible by URL. On many themes, selecting a combination adds a parameter to the address. Each combination becomes a distinct address displaying near-identical content.
Products split without differentiation. Some catalogs create one product per variant, which is sometimes justified, but with the same description copied over. You end up with fifteen twin pages competing with each other.
Supplier descriptions. The content is identical across every reseller of the same product. This is not internal but external duplication, and it is more penalising.
Products present in several categories, when the URL structure includes the category path. Three categories, three addresses for the same page.
These four sources call for different treatments, and confusing them leads to applying the wrong solution.
Variants or separate products: the criterion
This is the structuring decision, and it comes down to a simple question: do your customers search for the variant or for the model?
Three signs that a variant deserves to be a product in its own right.
It is the object of its own searches. If “S3 safety shoe size 47” is typed, the variant has autonomous demand.
It has genuinely different content. Description, visuals, technical characteristics of its own. A colour is generally not enough, a model with a different motor is.
It has a known commercial reference. On spare parts and tools, each reference is searched as such and deserves its page.
Conversely, a size or colour variation on the same model remains a combination. Splitting it produces twin pages that cannibalise each other.
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The cost of splitting
A point to know before starting, because the operation is often presented as purely beneficial.
Splitting thirty combinations into thirty products multiplies the content, visuals and maintenance work by thirty. A description change must be replicated thirty times.
It also dilutes the signals: thirty pages each receiving a little traffic rank less well than one page receiving thirty times more.
The rule of caution: split selectively, on the variants that meet the three criteria, and keep the rest as combinations. A massive automatic split is almost always a bad idea.
Handling the variants you keep
Three measures, in this order.
The canonical tag of each variant points to the page without the combination parameter. It is the basic treatment and it suffices in most cases.
The clean URL. Ideally, selecting a combination does not create an indexable address at all, the selection staying on the browser side. That removes the problem at the root.
Unique content on the parent page. Since it is the one carrying the rankings, it must be the best written, with a description covering the whole range of variants rather than a single one.
Writing texts that differentiate
On split products, the question becomes: how do you make thirty pages genuinely distinct without writing thirty texts?
Three techniques, in order of effectiveness.
The common block plus the specific block. Part of the description is shared, part is specific to the variant and covers what distinguishes it: recommended use, compatibilities, technical differences. Two to three specific paragraphs are enough to differentiate.
Structured characteristics. They naturally differ from one variant to another and they carry the information the visitor is looking for. On a technical catalog, they weigh more than written text.
Contributed content. Reviews, questions, customer photos naturally differ per variant and build up without editorial effort.
What not to do: automatic generation by synonym permutation. It produces artificial, detectable text with no value for the reader.
The case of supplier descriptions
A distinct and harder subject, because the duplication is external.
Reusing the manufacturer’s description as is puts you in competition with every other reseller on identical content. The engine will choose, and the criterion will not be your text since it is the same.
Three levels of treatment, to calibrate according to the importance of the reference.
On your main references, rewrite entirely. It is real work and it is the only one that produces differentiation.
On mid-range references, add a section of your own: your opinion, the use you recommend, the comparison with the other models in your range. The supplier description stays below.
On the long tail, leave the supplier description. These pages will not rank on generic queries, they will capture searches by reference, on which duplication weighs less.
Detecting duplication
Three complementary methods.
The indexing report in Search Console, watching for pages flagged as duplicate. It tells you what the engine observes.
An internal comparison of the descriptions, by textual similarity, which identifies the groups of near-identical pages in your own catalog.
A search by extract: take a sentence of your description in quotes into a search engine. If you get forty results, you know where the text comes from and how many competitors use it.
This last method is the fastest and the most telling for assessing the extent of the problem on supplier descriptions.
The order of the work
On an existing catalog, four steps.
Fix the canonicals first on the variants. It is quick, risk-free, and it treats the most voluminous source.
Identify the variants that are candidates for splitting, by crossing search volumes and commercial references. You will generally find few.
Rewrite the descriptions of your twenty to fifty main references. That is where the return lies.
Handle the rest in batches, adding a section of your own rather than rewriting everything.
The Split Combinations into Separate Products module handles the split on PrestaShop 8 and 9: selection of the combinations to turn into autonomous products, transfer of the visuals and characteristics specific to each variant, and preservation of the links between products from the same model.
