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For a websites that differ between catalogs (PDPs) what hreflang error causes the least harm? Obviously the best solution is to only have hreflang for shared products, but this takes more work to implement. So when no identical product exists... 1. Hreflang points to 404 or 410 error. 2. Hreflang points to 200 status "Page Not Found" page. This obviously has the additional issue of needing to point back to 100+ urls. I want to avoid having Google decide to ignore all hreflang due to errors as many correct urls will exist. Any thoughts?

The is a lot of info on the web about how business reviews/ratings improve local search result rankings. However do product ratings or reviews improve PDP/PLP/Homepage (not local) rankings?