By the way, those dialogue changes you mentioned (Luke to R2 and Han to Lando) aren't really special edition changes. There have always been various differences in the audio even from the beginning (which makes it almost impossible to decide what the real original version is). You see, when the movies were released, they made all these different mixes (mono, stereo, etc.), and each version always changed something, used different takes of lines, added or removed sound effects. And then, in almost every different release of the movies (and there were countless different releases in the '80s) there was a different sound mix with subtle differences in them. I think it's more coincidence than anything else that the Faces version of the movie and the special editions use different lines.
By the way, those dialogue changes you mentioned (Luke to R2 and Han to Lando) aren't really special edition changes. There have always been various differences in the audio even from the beginning (which makes it almost impossible to decide what the real original version is). You see, when the movies were released, they made all these different mixes (mono, stereo, etc.), and each version always changed something, used different takes of lines, added or removed sound effects. And then, in almost every different release of the movies (and there were countless different releases in the '80s) there was a different sound mix with subtle differences in them. I think it's more coincidence than anything else that the Faces version of the movie and the special editions use different lines.