Well to answer this old question, there seems to be a remaster but it's VERY subtle.
Also surprisingly only four of the tracks on the DQII recording are the same as on
http://vgmdb.net/album/1683 -- there's a 1996 recording date though I have no clue what disc they are from unless the original recording was held four years.
(Interestingly there's a 40 second intro to Beyond the Waves that only in the older recording)