Hi all,
I just noticed a potential issue with our websites. We have two ecommerce websites, one is a very large one selling all sorts of products, while the microsite focuses on a small segment of products. All products sold on the microsite are also sold on the main website. In the beginning of September, we upgraded the microsite to the same script that the main website uses to make it mobile friendly and update the design. They now look very similar.
Before, both websites used to rank on page 1 for a specific keyword. I have noticed that since we upgraded the microsite, the two websites have been taking turns ranking for the keyword. For a few weeks the microsite ranks and the main website doesn't rank for the keyword. Then for a few weeks only the main website ranks and the microsite doesn't.
I think the reason this is happening is that Google understands that the content is the same and the websites are both owned by the same company. Fair enough.
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I remember reading an article about this phenomenon before but can't remember where. Does anyone know which article I'm talking about (it would have been on an SEO blog/website, e.g. Moz, SEJ, SE Roundtable etc)? I'm not even sure what this phenomenon is called.
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If we can only have one of the pages rank, we would prefer it to be the microsite at all times. Would a canonical tag on the main website referring to the URL on the microsite fix this?
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I think at the moment the product descriptions are either very similar or identical. Would it help to make them more different to get both to rank again if that is what we wanted to do? In the end it is still the same product being sold by the same company - after Google has already sort of merged the two, would they "un-merge" them if the content was more different?
Thanks in advance!

when looking through the 13,100 results but they just seem to be one every once in a while among