JTEC and SBEC controllers are done offline, all you need is VIN to be programmed with scanner (JTECs have three connector sockets, SBECs have two). Newer NGS controllers have to be done online as they come blank if new, VIN writing is also required. (NGC controllers have four connector sockets). If  NGC is installed from an used vehicle, then you can do it offline, just change VIN and relearn Immobilizer if equipped, but you might need more than a scanner to do it. For Chrysler/Dodge, Drewtech's J2534 and Toolbox software lets you change VIN and reset Immo on used PCMs/ECMs, but Toolbox won't do it on newer vehicles with CAN protocol. You could avoid the immobilizer hassle if you buy them new.