Thank you for pointing the mirroring. I see now that most probably is the same person (extremely similar hairline now). But still, even if it is the same person, these are two different takes, maybe they needed to accentuate the makeup for shock value and they asked the girl to reshoot. There is no doubt that these are two different takes, the timing and blinking are not perfect and the hand gesture is without a doubt different. See for yourself. Here’s a side by side comparison of the hand gesture (mirroring added by me).
Yes, for the second comparison, there is about 2 to 3 frames difference between left and right. But again, even taking that into consideration, we can see that these are also two different takes. At the beginning of the second comparison (https://www.youtube.com/watch?v=kcA1nebGzgg&t=98), the girl on the left fixes her hair for about 45 frames before starting her dance and clapping. The clapping is almost perfectly in sync (again, about 2-3 frames off). So, there is a clear discrepancy in those 45 frames. Plus, there are other differences, for instance, the glasses straps are behind the girl on the left and in front of the girl on the right and also again, the hand gesture is not perfectly the same (when she touches her chin).
Yes, definitely. The camera angles actually help to show that in both comparisons, even if it is the same girl, those were two different takes (in both cases).