If I have an AMP page that's an exact duplicate of another page on my site, will it hurt SEO?

If you’ve created your AMP pages the right way, then no. It won’t cause any duplicate content issues.

However, if you don’t setup your AMPs correctly, then every page of yours will have at least one duplicate, which is a problem.

Here are 6 steps to create your AMP pages from scratch.

1. Create your AMP HTML page
2. Include an image
3. Modify presentation and layout
4. Preview and validate
5. Prepare your page for discovery and distribution
6. Final steps before publishing

The most important thing is to put your canonical URLs in place and you should be fine. AMP format is very strict and you should ensure that everything’s implemented by the book, otherwise it won’t work and your site can quickly litter the SERPs with duplicate results.

Hope this helps.