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I am working on SEO for a Shopify store.  Their products are very similar, hence the pages are so similar that Moz shows them as duplicate content.  The only difference in the product pages is the title and model number.  I am going to "go for the gold" and try re-writing all the product descriptions.  It's incredibly difficult due to the products being nearly identical with just a minor variation.  I know I could go down the road of just creating variants --- but the customer is not down for that. Here's my question:  what constitutes duplicate content?  80% of the content, 90%???? If I can going to re-write the descriptions, what should I aim for? Thank you!

My site is a directory that serves several regions.  Each region has it's own "home page" with specific content for that visitor about their region.  Right now we use Google location recognition after you visit the home page to redirect you to your regional home page. I am in the process of reviewing the best way to implement our home page for SEO purposes.  Any advice or recommendations on how to present home pages that are location specific would be greatly appreciated. Thank you Steve