Yes, ROTS is the one with the fewest differences.
But AFAIK, there are other changes than this wipe :
- Wookie huts have extra details (moss and rust) on their rooftops (to make them look older)
- at the end, a different wipe and shorter “Noooo!” from Vader
- (some dialogues were changed or added, but this point is probably not relevant on a German version)
I may be wrong but I think that for $200, it’s worth saving it, if only for the color references and the 35mm grain.