Here is a truth about movie making. They end up with a ton of stuff that is never used and they often miss things they need and either have to do pickup shots or find something that they weren’t going to use that will fit it. In ANH, there are many shots of R2 from the Death Star control room (where he found out Princess Leia was being held prisoner) that were used elsewhere, particularly in the Falcon.
Ronster is coming from the angle that the cut that Ben Burtt was using for the main audio track, got edited in a few places AFTER some of the sound was laid down and is trying to uncover that cut. I can see the point to that. Star Wars Deleted Magic had several places in the film where they found that footage had been moved around and reordered things. (Ronster, if you haven’t seen that you must check it out)
And it is certain that quite a number of shots from ANH (used or unused) were reused for ROTJ inside the Death Star. Cooridor shots and the weapon firing in particular. But that also isn’t unusual.
We do know from Mark Hamill that Lucas was going for “faster and more intense” and that extended into the edit. My guess is that he was cutting stuff up to the end. My guess is that just reordering what we have will not achieve any of the previous cuts because what was cut is missing and not just moved around. One cut we know of was one of the imperial officers (sorry, I have never memorised all their names) in a longer version of his shot using the word Sith. Deleted Magic reused some footage to recreate what they saw as the original trench run. You would have to creatively reused shots (maybe in reverse) and audio and probably pull music from the full recordings to simulate what the longer cut might have looked like, but the stuff you need to recreate it authentically is not there. It was cut.
That original rough cut was in B&W and was Lucas’s worst nightmare using transnational editing techniques that Lucas wanted to abandon.
We know a lot about what he wanted from the scripts and storyboards, and we can glean more from the music recordings and how the final edit came out (obvious edits). The following films were not done quite so rushed and the last minute edits were better done. Remember how fast they worked to finish Star Wars in 77. 3 FX shots and the final end credits were not done in May 77 and were included in the wide release and international releases later.