The Japanese release includes a 6th "SuperStar" difficulty level unlockable via the PES Shop, whereas the standard PES version typically only has 5.
to play the game on original hardware via OPL (Open PS2 Loader) or on PC using the PCSX2 Emulator
If you're looking to relive the Master League glory days or just see how the PS2 handled 2012-era football, you can find the ISO through dedicated preservation and community sites:
If you use search engines to find this ISO, avoid these red flags: