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Since no one replied to me on the lore talk page here's a the same text on a forum post:

I think they're the same thing, but the first one is more likely to be spelled incorrectly. I'm not deep into the lore, so I don't know which spelling or pronunciation is correct, but I always assumed that the first spelling was a mistake on the part of the speaker, and the second spelling was supposed to be correct.

By the way, TESO confirms that "Unthrappa" is the correct spelling, and says that the best translation for it is "atonement," but I wonder if "Undrape" might actually be a more literal translation-- the unclothing of a person in order to cook them, as it were, with the purpose being atonement for the person to whom the Unthrappa is served.