I found another video where you can hear her Brandy Alexander speaking for an extended period of time. To me, this sounds like Brynn before she did more voice training. At ~2:10 in the video you can also see she has the same dimples as Brynn. I also noticed that if you look at the first comparison picture posted above, the ear shape is basically identical.
Here's a part of how she's described:
So same height that Brynn claims while also saying she's a fan of sci fi and anime. Brynn has done cosplays on her Instagram, including one where she dressed up like Bo Katan to go to a convention.
If you believe they're separate people, then you have to believe that there are two >6' people of different genders who look alike, sound alike, have the same tattoo, and both did porn in some form. They also have similar interests in sci fi and anime.
Either they're the same or she has a twin she doesn't talk about.