Are the US and Japanese versions of GT3 compatible?
No, the saved games are not compatible, so you can’t use your Japanese save with the American game and you can’t trade cars between versions. I just won the American Championship in the Amateur League and got a crappy bonus car instead of the rare Camaro Race Car and I saved it after I was done. Is there any way I can win the Camaro Race Car now, or is it too late? Yes, you can. In the Championship Series and Endurance races, which give out one of four cars randomly, you can win prize cars more than one time and you can even win the same prize car over and over again.