About a third of the way down
Well, I have managed to track down the origin of these observations. In the Jan/Feb 1997 issue of Movie Score magazine (also reported recently on T-Bone's site) Michael Matessino (SE Album editing and Assembly Supervisor) writes a hugely detailed article on the Trilogy's soundtracks. On page 15 of the magazine there is a side box entitled ' 70mm Strikes Back'. In addition to the details taken from this article and published on wikipedia it reports:
Michael Matessino, who saw both versions [35mm and 70m] around 70 times in 1980 kindly documented some of the differences.
- 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", the scene cuts to inside the Rebel Cruiser where Luke says "I'll meet you for the rendezvous" etc. Not in this version are two more establishing shots of the fleet and an interim effects shot over which lando says "When we find Jabba the Hutt and that bounty hunter we'll contact you".
For explanation he adds:
Track 12. The Rebel Fleet/End Title: In 70mm versions of the films, the final scene began with this cue. Preperations of these prints began before the film was 'locked', so the 35mm version contains several differences. The most prominent is the includion of extra dialogue and a few additional effects shots to the closing scene. The re-edited sequence required the tracking of a section from 'Yoda and the Force' to precede 'The Rebel Fleet'. For both prints a few bars of 'The Rebel Fleet' were eliminated.
So there you have it, the 70mm print of TESB is indeed different, but not that different.
Interestingly the article also informs us that the 70mm print of ROTJ used the 'Main Title' from 'Empire', but no one has ever been able to determine why.