It's not just the starfield thing it's the detail different and the colour/brightness, things that are going to be crucial if I have to replace the German THX LD scenes of Jabba talking (the subtitles are over the picture instead of in the border) with scenes from the definitive LDs, so the French set it is as it's mastered from the same source as the German set (you see the same burn marks in near the beginning of ANH when you first see C-3PO an R2-D2).
I wonder if the side changes of the French set are at the same time(s) as the German set...
*looks around to see what he can make a quick penny on eBay with*