Iron Man Mark 3 helmet vs Mark 4?

[takaaaa]

Greetings,
I want to remake my Iron Man suit and going foam again but want to 3D print my helmet since I got a bunch of PLA I need to use. I want to make the Mark 4. I have been looking at both and the mark 3 jaw looks like it stick out more and more rounded, but other photos they look almost the same and I cant see a difference. Theres many many stl files for the mark 3 but not the mark 4. So is the mark 3 a lot more different than the mark 4?

 

[vincentallen2]

I was under the impression that mk 2 through Mark 6 were all pretty much the same, except for colors, and subtle changes to the chin and teeth on the cheeks

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