I've just been compairing the two videos some more. #4 in Celebrate! looks older because she's wearing more make-up, but some of the expressions and in close-ups her teeth look the same to me. And #4 has a very small tattoo on her left wrist. Unfortunately we only see #13 in in Bachelorette Party from the other side up until the very end of the video, when she very briefly puts her arms up. If you freeze frame it, it does look like she's got a tiny tattoo in the same place. Or is that just my imagination seeing things I want to see?