Have you ever looked close at R2-D2 with Sensor scope the Stickers vary wildly. There are also single stickers and double stickers. 
Here are the different COO marks found on R2- Other variations can be found in the color of the Blue on dome, paint on legs, and he can also be found with a hard-torso- (hard plastic drum, a super rare variant. ) It appears the from is the same as the regular R2 since the dates are all 1977.
check out my guide on Figure variations for more info.
