A blanket statement would be meaningless as there are just too many variables.
IMO: Your question would best be answered on a title by title basis and even then it would be difficult.
The Japanese releases could number 6 or more versions from the date you mentioned, some re-mastered, possibly more than once.
In the case of SHM-CDs, there's already 2 or 3 versions on several titles in the short time they've been available.
Some MFSL CDs have also been released several times, once by the original company and then by its buyer, Music Direct.
Santana's Abraxas comes to mind.
There's also HQCD, XRCD and Blu-spec CD.
So to compare some specific titles may involve listening to 10, 12 or more CDs. I'm sure it could be done but it wouldn't be easy.
IMO: Your question would best be answered on a title by title basis and even then it would be difficult.
The Japanese releases could number 6 or more versions from the date you mentioned, some re-mastered, possibly more than once.
In the case of SHM-CDs, there's already 2 or 3 versions on several titles in the short time they've been available.
Some MFSL CDs have also been released several times, once by the original company and then by its buyer, Music Direct.
Santana's Abraxas comes to mind.
There's also HQCD, XRCD and Blu-spec CD.
So to compare some specific titles may involve listening to 10, 12 or more CDs. I'm sure it could be done but it wouldn't be easy.