Duplicate page content for similar products, but they're not the same.
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Hey there! Tawny from Moz's Help Team here. I think I can help explain why these pages are coming up as duplicates.
Our tool has a 90% tolerance for duplicate content, which means it will flag any content that has 90% of the same code between pages. This includes all the source code on the page and not just the viewable text, so often it's a matter of finding the best answer for the duplicate pages in question.
For instance, often with ecommerce sites, product pages will come up with duplicate content between two colors of the same item, and in that case it's good to use the canonical tag: https://moz.com/learn/seo/canonicalization
If there are two versions of the site that exist - for instance, example.com/subfolder and www.example.com/subfolder - you can put in 301 redirects to the correct page: https://moz.com/learn/seo/redirection.
If it's just two pages on different subjects but thin content, filling out that content with an extra paragraph or two can help.

There are more in-depth explanations of common answers to duplicate content on this page, if you're curious!: https://moz.com/learn/seo/duplicate-content
I hope this helps! If you still have questions we can help with, feel free to drop us a line at help@moz.com and we'll do our best to answer them for you!