Unfortunately The game was released with the same IP to all countries even if the naming is different, There are also many games which have large variations between regions.

I cannot differentiate regions of the game just because one country is better than the other.

ps. Tokyo Geneva runs faster than Tokyo-Seoul even if seoul has faster cars.

There is no "race" between regions, people can choose to run whichever region they want. I ran Tokyo-seoul because it was unique, not because I could get a gold medal, I have 5 WR and I don't have the "need" for another WR, people can see for themselves if they want to run EU,US,KR,JP. Region is literally irrelevant to the game's actual name.

https://en.wikipedia.org/wiki/Gran_Turismo_Concept