Are these heads really accurate to scale? (HT 1/6)

[SubjectNameHere]

I know Iron Man's helmet is very flush with his face and Kylo's is a little exaggerated on his head, and I'll buy that the Stormtrooper's is borderline astronaut-y, but I wanted a few more opinions because they look so vastly different in size side-by-side.

 

[kazar123]

I'm not sure about Iron Man but I'd say that Kylo and the Stormtrooper are pretty accurate

 

[SubjectNameHere]

Nice reference pic there. Thanks for that. Yeah the stormtroopers' do look big but not disproportionate to their bodies. Maybe it's just tiny Iron Man compared to them.