Someone correct me if I'm way off here, but I believe the set that shows the "gold" weathering on the right gaunt is the stunt.
For the left gaunt, I think the stunt is the one with a big chunk broken off just below/in front of the calc pad.
the MoM are hero imo, as the AOSW have indeed the kind of gold weathering on the right gaunt, are totally messed up on the right side of the left gaunt, and overall don't have the tiny detailed scratches on them...
and the kind of grey dust on the stunt's from Aosw..
Doh! I spent the better part of the evening researching the Jedi gauntlets with a friend, and by the time we finished, I was spent.
First, I'm hesitant to label the gauntlets "hero" or "stunt." Generally "stunt" pieces are of lower quality or finishing work than the "hero," and I don't see any delineation in quality among the gauntlets we see on exhibit.
Anyway, It's going to take a little time to sort out decent quality images, but in the mean time, the AOSW Left gauntlet is the primary gauntlet used in both the US and UK Jedi filming locations and in publicity stills.
Personally, I'd say the AOSW right gauntlet is not the "primary" ROTJ, but it's certainly debatable. Another gauntlet, which is not on exhibit, appears throughout the Jabba's palace scenes and in promotional stills. So, I lean toward that gauntlet being primary, but again, it's debatable.
There are few Buttercup Valley/Yuma scences detailed enough to positively ID the gauntlets, so at the moment, it's tough to say where else they might pop up.