Moz metrics

[AMHC]

This discussion is strictly theoretical... I won't hold anyone to their answer.

If I have 2 websites that are identical in every way and let's say the domain authority for both is 40, and I 301 redirect one site to the other, what would the DA become?

Same question for single pages, both with a PA of 40. If I 301 redirect one page to the other, what does the PA become for the remaining page?

[AMHC]

Thanks, Linda. What I'm looking for is a theoretical number.

[Linda-Vassily]

If you have two identical sites, Google would choose one of them and the other would drop out of the listings. A not-uncommon situation like this (two identical websites) does happen when there is no redirect between example.com and www.example.com. In that case the benefit of implementing a 301 redirect is that the indexed site gets the benefit of the way the two sites are not identical. That is, there might be links that point to the version that Google has not chosen that are lost without the redirect. So the rank of the site that is indexed would probably go up when the 301 is implemented; how much would depend on the quantity and quality of the unique links to the redirected site.