they work differently, a vr remote is designed to disarm ylur imobiliser using the theft deterent module and the contact ring around the ignition barrel, vp's arent mongoose, they use a module under the dash like vn's but disarm the immobiliser using the remote, vr's also disarm using the remote but only for 20 seconds, after that the security light will come on. i dont see how any key can be pre-coded ive never heard of this and is probly the reason it didnt work.
as i say with all holden parts, stick to what suits your car, and dont listen to people that say otherwise.
id prefer to program a remote off the tdm or bcm rather than copying a key that doesnt work properly, it takes us like 15 seconds to do vr's and vs's