Yes, that's correct. Pr and Un/testnet are completely cross compatible.

You can't send Pr to an Un mainnet addy--they don't use the same leading bit in the address (u vs U) but from the Un testnet to the Pr mainnet and back again works perfectly!

Sorry to come off curtly--I'm not trying to dilute or take anything from Un, just give some new things to play with as Un development has moved slowly in my time away.