I think a lot of the face "progression" is overblown.
Jay's face doesn't look THAT different comparing both pictures. It's also hard to tell because certain chemicals make you bloat more than others, he could've just had a few bowls of oatmeal and it looks like his face got stung by a bunch of bees.
Anyway, I still do think some of these newer compounds alters these guys faces, but it's also hard to tell because more comparison pics are judging between them at 18 and them at 40, there's obviously going to be a structural difference.
As for Kevin Levrone, you can tell his face is much more slender. That could be related to water intake and the fact that he doesn't consume as much, he does more cardio, he doesn't take gear, etc.