So, it seems there was no picture differentiations. They came close to including an earlier version of a cloud city shot and ommitting a final rebel fleet shot, but in the end all these things came through at the last moment due to the tireless work of the crew, and the prints were able to ship out in identical picture lock.
This is not true. I saw the 70mm version of ESB six times when it was shown in Seattle, audiotaped it and had heard dozens of times at home. When I saw the 35mm version I was shocked to see an extra scene of rebel spaceships that wasn't in the 70mm version. I think the Lando dialog was added too (I no longer have the tape). The 70mm went from the jump to lightspeed to one shot of the rebel spaceships zooming in on the medical ship. The 35mm has an extra scene of spaceships that was spliced in.
I remember reading in a magazine that they added this scene because the audience clapped too long after the jump to lightspeed, and people couldn't hear the dialog afterwards.
As for the other scenes, I do recall having an early bootleg that differed from what I saw in the theaters, and also differed from the video release of ESB.
Marc