That's interesting if it's the case. They would have had to make a new "glass master" disc to add a digital track to any reissue. I don't know what video format the master tapes would have been at the time. Could they have simply added a digital track and left the original analog alone?

Are you listening to the analog with the CX noise reduction on? Leaving it off can often make things sound a little different. Some later Pioneer models are guilty of having lower analog output to make the digital sound "better".