Key Fob/Plipper

[Monaro Pete]

I have two separate two button (red & black) type fobs that I purchased of eBay. They both worked fine on the old Terrano, but don't want to on the new Terrano.
Both trucks are the same year, but the latest one is an SE with ingnition key & two buttons all in one (this is fubar ). Does this mean they have different frequencies & aren't compatible?
Where is the instructions to program them that I remember following some years ago?
Sick of using the key & sticking the key in the ignition to switch off the alarm.