adywan said:
And only some audio differences were used from the 70mm for the SE. the 70mm wasn't the final version as Lucas ordered a few extra fx shots of the falcon at the end amongst others. The 70mm was the first version with the 35mm being the final version, prior to 1977

That page I linked to does seem certain the 70mm was the later version, which Lucas did last minute changes on. Which would fit with it having extra dialog. I'd like to believe that the 35mm was the later one, but I'd like more info before being sure on that.

Were they both released on the opening day?