I knew a guy who had been working on a VW/Audi manufacturing line in Belgium. I think they were assembling golf and A3. Both models were assembled on the same line, I wouldn't vouch that all posts were exactly assembling same parts, that wouldn't be true, especially as fit and finish and some specs are different, but for his particular post in the line, he was installing same part and was only told to put glove before working on the Audi ones, basically to avoid leaving fingerprints somewhere most customers would never ever look anyway.