Yes! Mr Mold Maker is right. The line near the bottom of the side panels is now straight rather than kinked in the middle. Everything else is identical to AOU and The Dark World (which were the only films so far that did not have any changes between them), down to the number of handle rings, dimensions, and runes. The Celtic knot pattern is actually the same as TDW/AOU, though different from Avengers and the original Thor.
Now while it's possible that it's just a CGI hammer, it seems a bit unlikely since the CGI hammer in Thor: The Dark World was the same as the real prop, both of which have the kinked line, not a straight line:
(CGI)
(Real prop)
So is it possible it's just a stunt/CGI hammer? I suppose it cannot be ruled out, but this was not used for CGI hammers before, so they clearly had an accurate CGI hammer for TDW already.
So between TDW and AOU there actually were not any changes to the runes, the hammer dimensions, the pommel cap, or the two engraved lines on the bottom of the hammer (which are each different from both Avengers and Thor 1), but this side line is different.
So I think that's significant - at least for people wanting to make faithful replicas.