It’s impossible to know for sure, especially when it comes to audio, since the vast majority of changes before the 1997 Special Edition were minor audio alterations.
That’s very interesting about the Biggs scene being included. I had never heard that there were prints with that scene included.
What about the comic book that was re-released as a Wal-Mart exclusive with the 2006 theatrical version? That had all the deleted scenes included, although Jabba the Hutt doesn’t look like the slug from Jedi or the actor used in the 1977 footage.