Okay, I think that their may be some dialog discrepancies between the floppy and Monkey Madness versions of MI2. As far as I know, if they do exist, SCUMMVM makes them "re-appear" much like it does the lite version of the game. It's definitely not a space issue, because Monkey Island 1 and 2 are each only a couple megs. The reason the CD has as much info as it does is because of the CD tracks for MI1 and the CMI demo.
I'm tempted to say that these dialog changes don't exist, but I seem to remember reading about it and then testing it myself to find that some things were in fact missing. Was the line "He looked pretty steamed" after Largo falls victim to Guybrush's bucket trap and storms off one of the supposed ones? I can't be bothered to pull out my Madness disc and get it running without SCUMMVM. One thing I'm fairly sure of is that everything still exists in the data files.
Also the CD version of MI1 removes the stump joke as well as the reference to it in the ending credits, but you probably knew that.