There are more changes than that. They are welding the top motor mount instead of a bolt on to stop the stressing and cracking of the frames that some are experiencing. They also are going with beefier ball joints with harder internal components. The tierods are a bigger diameter which means the 2003 quads can't use the new ball joints unless you go with the increased diameter steering components of the 2004 quads. There are a few other changes, but small. So you are right, they are close to the same as the 2003's.