One of the Walt Disney Studio's first films without Mickey Mouse was "The Skeleton Dance". And, like so many early Disney cartoons, the bulk of the work animating it was done by Ub Iwerks. However, in the early 30s, Ub left Disney for Columbia for more money as well as getting his name on the cartoons. "Skeleton Frolic" is one of Ub's Columbia cartoons...and it sure seems like an updated color version of "The Skeleton Dance"....and I can only assume Walt Disney thought the same thing.
I was never all that impressed by the Iwerks cartoons from Columbia. However, "Skeleton Frolic", while not original, was wonderfully animated and fun.