2 ENTIRELY different systems.. IF ALL the keys are lost for a vat. AND you cannot get the original key codes, you need a vastly CHEAPER interrogator tool to find which value vat key you need.. AND if the lock is NOT original with the vehicle, you just bought a new lock as well.. close to $200 installed in my area.. PATS require NO tools, but, time.. 30 minutes or 10, depending on what year it is.
--Shiva--