It could be that you unconsciously tapped into the same variation upon a theme, given that each of the mythical Twelve Labours serves as both as basis and a hint as to the nature of each challenge. Augean Stables have a lot to do with social mores, dignity, pride, and all that jazz.

(And can I say, I still cannot wait for the Eight Labour. It's infuriating to think we still have two more to go before we reach it).