I haven't looked at them in ages, but from what I remember it's just the new covers that make them different (which, by the way, I have to say I never really liked those airbrushed looking covers on the Rebel editions). Also, welcome aboard!
There is actually a bunch of different things in the Rebel editions. Pages that were drawn but never used, different textual introductions, maybe some prose by David Quinn as a back-up feature in one of the Rebel editions....will have to go look through them again but I remember a lot of stuff was different. May have even varied a bit from printing to printing on the Rebel stuff....
Leave it to a religious Conservative to use a Seth McFarlane 'Family Guy' quote in his signature and to not realize that Seth McFarlane's whole purpose with Family Guy is to make fun of religious Convervatives.
fritz whistle was the backup story in the Northstar original Faust comics. Some of the Fritz art was a story and some pieces were portfolio style. It was by Joe, they were reprinted into one book by the revamped Northstar with a cover by Joe and Tim.
Some art for # Fritz 2 was done, but never published, I think I have the cover for # 2.