Question re Japanese reissues: which is the "correct" serial #?

[mjzee]

On Japanese reissues, there seems to be a different serial # on the spine and on the disc itself.  Which is "correct" in referring to the copy I own?

Example: Tubby Hayes - Down In The Village.  On the spine of the CD jewel case of the copy I recently received from CDJapan, it says UCCU-9777.  At the bottom of the disc itself, it says UCCU-90383.  Which is the # that most people use to refer to their copy?

[Harbour]

often they repackage releases using older versions artwork, the correct cat no will be on obi & disc

[king ubu]

... and sometimes they just add a second OBI on top (I think there was only one shrinkwrap in the one case I've seen/bought, so really just two OBIs on top of eacht other)

[jazzbo]

Often a different number on the inner hub of the cd indicates that for this new release they used the mastering for the earlier release.