Skips that DONT work on PS1 JP:
Swamps of Naboo Jar Jar Skip (Tree not clippable). Otoh Gunga Guard has invisible wall (must be killed). Gardens of Theed Cannot jump forward from exploded pillar, must do PC strat. Mos Espa Arena Junkyard after Watto has a different layout, can still get down there but can't seem to jump over wall. Coruscant Wall collisions in "Underworld" fixed, can't skip first "elevating platform" or fight the boss from above.
Rolling distance is increased. Padmes Lighting gun has a much greater distance. No Japanese dubbing so dialogue isn't faster. Some textures/railing added to the ceiling of Mos Espa Arena room with "thief".
Probably a bunch of other stuff was changed/added, will buy a JP copy at some point and do a proper playthrough/comparison. As it stands there's no way this version is competitive unless it has skips of its own.