It is said that the Hungarian release(first release) and the foreign release(American, UK, France) have different cutscenes. The Hungarian version had cutscenes that had alot of uncompeleted textures, poorly made intro and the opening of the game actually was live action but in the other releases it was fully CGI. It was said that GT didn't like the some of the live action scenes because the background and the actors didn't blend very well. However GT was kind enough to let the in-game messages from the Hungarian version undisturbed.
Imperium Galactica is actually a remake of Reunion, but the storyline for both of em are very different.