Yes, you get for these 3 always worldwide the same releases, except Italy.
I'm not sure for Fod and FAFDM. The rights for the English speaking market are also by MGM. But at least for Germany and maybe Spain it is different, cause both co-produced them. That's why the German releases of these 2 are differing from MGM discs. Differing in case of the master used for the discs, the bonus section and the English language options were licensed from MGM and are mostly or completely identical.
The situation for My Name is Nobody is similar to those 2.
But for GBU, OUTW and DYS there is always an Italian version and another one for the rest of the sorry world.