Technically there are 6 versions of Moses.
Prophets
Warriors
Starter G/H
Cloud of Witnesses
Legacy Rare
Prophecies of Christ
The Warriors, G/H and Legacy Rare are essentially the same card however.
Assuming you are referring to the Warriors, CoW and PoC versions, I believe you can use all three, and you could even use a 4th as long as it wasn't the CoW version (which is limited to one per deck).
**Edit**
w/ Aggie
