ok, back to side by side.
Lets call them A, B and C.
A is the skin tone that she would be so if B is the same body the skin tone has been adjusted... That could explain the different definition of the ribs but doesn't explain the different muscle structure in the neck.
Whilst there is a question mark over those two it is possible that they are indeed both the same model. Body C though which will be the body from which the measurements were gathered is not the same body as A and B. To me she doesn't even look close to being the same proportions or detailing.
I wouldn't kick any of them out of bed for eating crisps, but my feeling is that at least one of them is not the same model as the others.
All the best,
Shamus.