Hey Es Nes.
You're right, it's the one and the same.
Aysedasi - SCGT on the pc is leagues apart from the PSX version. The games are so entirely different that it is shocking. I'd probably say it is like comparing the old LeMans PSOne game with the PS2 (or the even better Dreamcast version) LeMans game.
PSX SCGTs car models are non-existant, I would call them blocks on wheels to be honest. I just knew I had to get rid of that game or suffer the ridicule of my peers if I ever mentioned it in the same breath (or conversation) as the mighty TOCA or Gran Turismo games.