Is she the same girl ?
 

Is the girl in blue bikini the same than all the others ?
I like what she is showing...

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Pictures “04” and “19” offer a good view of the left ear, as does the bikini image. The subtle drop at the lobe, the inward fold at the back, and the square crease at the top seem to match.
Also, the left corner of the mouth seems consistent in all images.
The spots on the right leg don’t show in the bikini shot, but the resolution might be too low for the spots to be visible.
I would say yes, it’s the same girl.