Wasn't the "workprint" (aka the source for Backstroke of the West) just the theatrical version with a time code? I don't remember any dirt or cigarette burns, so it was from the DCP version, right?
Was the 35mm theatrical cut of III different from the DCP theatrical cut, as with II? (And was the Russian bootleg, the one I once saw a classmate watching on his iPod or similar device, taken from 35mm?)