Yep, a majority of those countries use NTSC. They would have an NTSC version of the game as well, as it was sold over there.
If that's what you're asking.
Edit: After looking on Wikipedia, there were several version of GT Concept:
Gran Turismo Concept versions:
Gran Turismo Concept: 2001 Tokyo Collection
Released only in Japan in the year 2001 for 3,200 yen. It first appeared in 2001's Tokyo Motor Show
Gran Turismo Concept: 2002 Tokyo-Seoul
Released only in Korea on April 9, 2002, this game featured Korean cars from Hyundai for the very first time. This game was based largely on the Gran Turismo Concept: 2001 Tokyo Collection and served as a launch pad for Sony Computer Entertainment Korea's Playstation 2 launch in Korea.
Gran Turismo Concept: 2002 Tokyo-Geneva
Released in Europe, Asia and Australia (Asian version DVD-9 was not released in Japan) in July 2002, this the most complete "Concept" version, giving all cars from others two previous versions adding a total of 65 new cars. The Asian version has a Tokyo Motor Show documentary.
It might be worth researching into which cars each version had, then putting them into a list.
That wouldn't be a bad idea at all. 👍