Okay guys, I've compared Jazz Goes to College and Gone with the Wind from the box set against the original cds.
I'm on the fence. They do sound a little different, but not really significantly. The box set versions are mastered LOUDER than the early cds. Hoffman board people would prefer that not to be the case I'd guess. There does some to be a bit of a difference between the two versions, but essentially it sounds like the same mastering with a bit of eq difference, possibly related to the loudness, or a pass from an equalizer. They don't sound significantly different to me.
I'd invite other opinions as I'm not in one of those "frames of mind" to do extensive comparisons this week.