Original 1980 35mm stereo (and all subsequent remixes until the SE) mix: "you don't taste very good"
Original 1980 70mm 6-track (and SE): "you were lucky to get out of there"
Han's line in JEDI:
1983 35mm stereo (and all releases after until SE): "It's alright, trust me."
1983 70mm 6-track (and SE): "It's alright, I can see a lot better."
There are many other 6-track/stereo differences, but those are the main ones in each film. (SW has too many to count.) The reason these 70mm lines are in the SE is they used the original 6-track mix as a basis for the new 5.1 mix.