Don't take my statement as a go-ahead but honestly it could be the same girl with different hair. I know I change my hair all the time from red to dark to super short with ass length. It could just be different weave. Her face looks the same.
Also, don't trust porns. I've been in a lot of porn videos, problem is the women weren't actually me. Just some black chick that looks like me. I had to take a few double takes watching ebony porn. Like "damn, when I did sleep with a black guy!?" One even had a back tattoo similar to mine. Try explaining that to a jealous ex-boyfriend