-The dimensions are a bit tighter. (The SNES logo is closer to the main image on the bottom right)
-The Official Seal isn't the same. (Official Seal vs Official Seal of Quality)
-The main image is just a little larger, possibly blown up a bit.
-The contrast and vibrance look to be higher than in the original.
It's tough to spot those things unless you're looking for them, though. You just have to hope for your seller to be upfront about stuff like that.