Not for wipes and dissolves and opticals though. The "original negative assembly" pieces are actually second-generation copies that have combined two original pieces. The original original pieces are not used because they have to have a wipe combining them on a copy. For the SE, rather than cleaning up or scanning the second-generation copy that combined them with the wipe, they went back to the original original camera pieces in storage and re-combined them in a brand new transition.

So, for instance it might look like this

Camera negative piece A (sandcrawler) + Camera negative piece B (stormtroopers and dewback)

[copied using an optical printer to overlay a wipe on the cut between them]

New original negative piece C that starts as A (the sandcrawler) and then wipes to B (the stormtroopers) within the same shot

So A and B are then put back in storage and C is the actual piece that goes in the negative assembly.