The differences between the two fourth drafts don’t have anything to do with the lost cut. Only footage that was shot has any importance, and we have the Greedo footage that was presumably used in the lost cut right there. The existence of Montross in earlier drafts isn’t any more significant than other early draft differences.

Sure, it’s interesting to look at stuff that didn’t make it to the shooting script, but that should be discussed in a ‘script differences’ thread in the OT discussion area.