Virtually no difference at all actually, I would say the only difference is the double sided tape residue on the inside, but other than that, it's exactly the same.I think some others have attempted to make offers before and they were turned down. It's funny though because this is only the stunt hat and it's on sale for like 3 times as much as the one Michal Cera wore isn't it? Ive asked a couple of costume commissioners for quotes on a replica and they said it was too complex.
Also Kyo since you have the original have you noticed if there's any differences between that and the stunt version.