Originally Posted by Lindy
FFX released in Japan -> FFX released in US -> FFX International released in Japan (because the Japanese wanted more) -> FFX Internation released in Europe, under the name of FFX.
So yes, the Japanese do have all the extra stuff, in fact I think they even have an extra ending after you beat Penance, though I'm not sure.
It happened with FFX-2 as well, the Japanese got FFX-2 International and Final Mission, but because FFX-2 was released in Europe before that was released, we just got the normal version.
It's just about timing, really.