Trooperman, you're mistaken about these differences being on the 70mm version of Empire. I take it you've never heard the in-theatre recording made by David Morgan that surfaced recently. An accurate list of changes in the mix can be found here.

Anything not mentioned in that thread is incorrect—the 70mm version is actually extremely similar to the 35 aside from a few small details. All of those other changes were made after the original mixes had been completed, appearing in foreign language dubs and so on, and apparently the 16mm version got the alterations as well. That they later resurfaced in the SE has nothing to do with it, because the 70mm version was actually the one they made first, and everything that followed was a modification of that.

So apparently, the 16mm version is a completely separate mono mix that is unrelated to either the 35 or the 70. Interesting . . .