Two different versions of the PlayStation release exist. The second release contains a number of bug fixes and balance tweaks, and also reduces the loading times. It carries the same Sony part number and JAN code as the original release, but there's a way to tell the difference: At the bottom-right corner of the cover, just to the right of the period after Fest.
, look for a small black circle. If there is one, it's the updated version; if not, it's the original release.