The 1994 and 1995 UK VHS were both available in full screen and widescreen and the Executor Box set is widescreen only.
From what I have seen, all three widescreen sets are the same with the only differences being with the Fox Fanfare. For some reason, the 1995 ESB and ROTJ widescreen versions do not have the Fox Fanfare but have a CBS FOX logo and fanfare instead
http://www.youtube.com/watch?v=Y1EI-cy_K50
After all these years of the Fox Fanfare - this is just wrong.....