I'm only familiar with the two versions of the commandments given in Exodus and Deuteronomy: I specified Exodus specifically to clarify that distinction, then wound up using an example that's the same in both of them. Oh well. I've never heard of a third, though; can you remember any other context?

I'd expect there to be exactly two versions, for the same reason that there are two creation stories in Genesis: the early books of the Bible are the first written form of a faith with two competing (though closely related!) oral traditions.

Anyway, now that I've thought about it more I think this concept would work better as a riff on the book of Proverbs.