I'm not sure if Qld rules are any different, but usually the Compliance Place refers/relates to the Chassis and the number stamped into both, and will describe the engine originally fitted to that chassis.
If you want to use the 1992 Def Compliance plate on the Perentie chassis, you could stamp that number into the new chassis (and you should check the possibility of doing that in Qld), but you WILL need to certify the "New" Isuzu engine that is going into the "1992 Defender", despite the fact that the chassis is certainly designed around that engine. You might run into issues in that the Defender was never available with the Isuzu engine, and you will be going backwards in engine emissions using a 1987 complied engine in a 1992 vehicle.
Usually not permitted elsewhere, but Qld lets some funny stuff through.