The mandible thickness of the right looks like it might even be a target helmet. I can't imagine anyone casting that thick.
I do think the right imo has a better 'from a distance' look with it's paint though. It's patterning isn't accurate, and the weathering is too dark, but it does look like it uses more chipped layers than the middle, and honestly most people remember the helmet more darkly weathered than it actually is. The middle is more of a ROTJ-style scratched weathering, but with loosely ESB patterns, strange mixup.
However, yeah, the middle looks like a much better sculpt. The right is either a cheap target helmet, or a way overly thick cast that's going to be a bit heavy.
They are definitely not all the same source though, and I'm not sure I would trust anyone who tried to sell em to me under that premise.
