Besides typical English translation and localization, the English version of Kingdom Hearts II differs from the original Japanese version in the content of gameplay and several scenes. The Hydra boss in Olympus Coliseum had its green blood from the original Japanese version (which was taken from the film) changed into black and purple smoke in the English version. An earlier cut scene retains the green blood.
Xigbar's telescopic sight was changed from view with a crosshair and black shading around the sides to three glowing circles. An attack animation was also altered; in the Japanese version, Xigbar combined his two hand-held guns to create a sniper rifle, which was used to shoot the player's party during the telescoping sight sequence. In the English version, Xigbar does not combine his guns, but twirls them around and shoots at Sora with a single gun. The death of Organization XIII member Axel was slightly edited; in the original, he caught on fire during his suicide attack.
Port Royal contains the most content edits. Cut scenes were edited to remove some of the violence, such as William Turner threatening to commit suicide while aiming a gun at his head. Unlike the Japanese version, Undead Pirates do not catch fire when affected by Fire magic and their muskets were modified to resemble crossbows, though they still fire with an audible shooting sound effect.
Straight out from Wiki itself. If only people would do a little snooping around... (And before anyone goes all, 'Wiki is all LIES!!!', you need a citation for anything you alter or else they'll restore it to its original state before it was edited.)