Ok, so I pulled all the soundtracks from Raiders' DVD and BD and Temple's DVD and BD.

Here are the rear surrounds for Raiders DVD then BD:

Looking at the DVD the rear surrounds are almost mono (slight variations, maybe from the mixing) which wound be in keeping with the original 70mm mix having mono surrounds. Surprisingly the Blu-ray also looks mono but remixed, probably for more impact.

Here are the rear surrounds for Temple's DVD then BD:

So it looks like Temple's DVD and Blu-ray soundtracks are the same, at least for the rears. Again I don't know if this is from the original 70mm mix but it looks like the rears are mono also fro what its worth.

And last here is Die Hard on Blu-ray:

which surprisingly looks mono also similar to the 70mm. I will have to try to capture the LD to compare.