There were some minor differences; notably the alien makeup was simplified, making them more human in appearance. (In the movie, there was a fuller head/face makeup and prosthetics to alter the shape of the rib cage, while in the show the makeup left the face exposed and didn't affect the body.) The drug featured in the movie wasn't mentioned in the show, though nothing overtly contradicted its existence. (It is mentioned in at least one of the tie-in novels.) And yes, the spelling of Sikes's name was changed, probably for some sort of legal reason.
But aside from those few tweaks, it was meant to be in continuity with the movie. In fact, stock footage of some of Roger Aaron Brown's scenes in the movie was incorporated into the series pilot as flashbacks. So yeah, it's basically like Stargate