It would also (to me at least) make sense that Yoda makes some sort of natural verbal reaction to Luke aiming the blaster at him. As far as a possible difference between the 35mm and 70mm prints…I can’t say for certain what I heard in each because I saw TESB several times in both print formats.
Just lump it in with the grappling hook false memory, you’re in good company. Be happy you saw the 70mm prints so many times, they still present us with a preservation challenge!