As for the footage differences with Harmy’s, I guess that’s from Harmy doing his best, brilliant trickery to recreate the original from remastered sources that used slightly different footage. Again, I can only guess.
Nope. Harmy doesn’t sacrifice the original sync to make things work, as tempting as that could be for recreating wipes and such. The soundtracks are set in stone, synced to a GOUT standard. Harmy’s are at times imperfect by a frame or so, but not intentionally.