Nausica, you are right; 1/60 should be 1/60. The Zentaedi, like us are different sized. Millia is female and shorter than a Zentraedi male, so there will be differences. Some manufacturers don't always get the scales right. All I really do is models and I see differences between manufacturers all the time. If you compare people to people, you're safer. I've seen differences between the Q-Rau in various line drawings. Those problems make scratch building a pain too!
I don't have the toys (except a 1/60 VF-1s - I can't be ALL about models). Maybe someone here knows of an ongoing inconsistency... - MT