It was criminal how the very first Silent Hill game was not in the box set they released, which had 2, 3 and 4. Silent Hill 2 was not even the DC port from the Xbox, which is why I thought it was a lackluster collection.
I am almost certain that they could have added SH1 even though it was a PS1 game.
I really had no idea that the first SH had a Greatest Hits version. Do original PS1 games have Greatest Hits now?
From what I understand, on the PS2 games, most of the changes are on the game covers. Just a few slight changes here and there, the obvious one being the Greatest Hits label at the very top. As for the gameplay, there's a few games that are different from the original. I guess you'd have to look it up on online to see. Example: in the Greatest Hits version of GTA:SA, the "Hot Coffee" mod was taken out.