Depending on the specific pressing variation, the Japanese Special Edition often included bonus tracks that were rare at the time of release. In 1997, Western albums released in Japan frequently added extra songs to incentivize local buyers (who often faced higher import prices). These tracks are usually B-sides or remixes from the Bilingual era sessions, making this edition a comprehensive snapshot of the Pet Shop Boys' creative output during 1996-1997.
So, seek out that silver disc. Rip it to FLAC. Store it on a redundant hard drive. And when you press play, listen to "Discoteca." Wait for the bass drop at 0:48. If you don’t feel a shiver down your spine, you’re listening to the wrong version. Depending on the specific pressing variation, the Japanese