Ok, here's what I know is changed from '83 to '97 and from '97 to '04, am I missing anything major? (Improved effects aren't of a concern to me as I don't mind them; and arguably, I really don't have too much problem with the Sarlaac beak.)
Lapti Nek / Jedi Rocks (1997) Sarlaac beak (1997) Han commenting on his sight, during the Sarlaac scene (2004?) Anakin's eyebrows (2004) The ending (changed both times)
Ideally, I'd need a small amount of 1997 footage to fix this, though, I could do a proof of concept on the 1993/2004 alone.
Moll.
"Right now the coffees are doing their final work." (Airi, Masked Rider Den-o episode 1)