I'd like to know if these preparatory sketches for the cartoon Hell's Bells (1929) are indeed originals drawn by Ub Iwerks, all these sketches come from IMDB and I'm suspicious of this very unreliable site:



Curiously, none of the scenes shown in these sketches appear in the final cartoon, and the Devil seems to be very cruel there, as he drops all his assistants into a crevasse. There's also a giant, very long staircase, which I wonder what use it would have had in the plot.
However, these sketches don't seem to resemble those published on the Silly-Simphony.com website, and the paper isn't the same color either:


What do you think of these sketches?