"The Bowery Boys--Slip, Sach, Bobby, Whitey & Chuck--start their own exterminating service, and get a job which takes them to a spooky old abandoned mansion in the middle of the night. Meeting up with pal Gabe and his new French bride, the boys are tormented by mad scientists who try to convince them the place is haunted and then kidnap Sach in order to place his brain inside a gorilla."
Yeah, that sounds exactly like an exterminating service that eventually has to square off against the leader of the undead from another dimension. Just because the characters had the same jobs doesn't mean it's a remake or derivative.