As stated earlier, blood and bounce are removed in the US ports of 2000/2001, and of course the story is in English, so it's a trade off.
The US version of '99 Evo (the port of KOF '99) has bounce, I'm not sure about blood, but there is some editing from the Japanese version. Notably, the Korea team's ending, which in the Japanese version shows Chang and Choi murdering Kim and Jhun (well, fantasizing about it, anyway), covered in blood, with the sillouette of Kim and Jhun's hacked to pieces bodies, including Kim's decapitated head(!). In the US version, the blood (there was a lot of it) is changed to blue paint and Kim's decapitated head is removed from the picture. Doesn't really change the game, and I can count the number of times I played as the full Korean team on one hand anyway, but you asked for changes, so there you go. I am the king of run on sentences.