The Weavers Reunion at Carnegie Hall -1963 new LP

Well, it could be that you're playing CD's on a $20K reference level digital front end while playing LP's on a dusty, plastic Garrard record changer from 1963 that you snagged for $20 in a garage sale.

Or it could be something else...

I have the original LP and the CD and the LP sounds better on my system; have not heard the reissue LP.

Several reasons
1) Master tape has deteriated
2) Did not use master tape for remaster
3) Crappy job of remastering
Alan

I suggest double checking your analog front end.

But perhaps you can tell us about your digital and analog playback systems.