According to this article, Michael Matessino saw both versions around 70 times (once for each millimeter) in 1980. Here he describes the closing scene from the 70mm version in the same issue:

In the final scene, there is no tracked music from "Yoda and the Force." The scene begins with the first establishing shot of the rebel fleet, then cuts inside the Falcon for Lando to say "Luke, we're ready for take-off" (but a different take of this is used). After Luke says (voice over), "Good luck, Lando," scene cuts to inside the Rebel cruiser where Luke says "I'll meet you at the rendezvous," etc. Not in this version are two more establishing shots of the fleet and an interim effects shot over wich Lando says, "When we find Jabba the Hutt and that bounty hunter we'll contact you."