Although it is not unheard of that different regions have received different copies of the same master title from other regions due to some stupid marketting idea, I believe in this case it is more than likely the same
You are right, there are instances where different regions get different masters to press off of (DVDbeaver is a great site for showing this off) but in this case, all the discs WERE pressed up off of the exact same masters. Only the region coding and the menus changed.
And I also don't get the lack of love the Dr Gonzo set gets here. Keep in mind, this set is over THREE years old. And the color fidelity is STILL better than the TR47 set and the other captures often mentioned in here, save for the Zion and Jedi captures, done with VERY big leaps in technology between now and then. It's weird that no one's recognizing this.