Are the 3 litre and 1KZ versions not the same? AFAIK, only the softer version of the 70 series (KZJ78 and 71) received this engine, and prior it had the 2.4 turbo. There were no 3 litre options for the hardcore 70 series; recalling from memory there was the 3.4 13B , 3.5 PZJ and 4.2 HZJ, and now the non turbo V8 VDJ, although the 4.2 is still available.
Edit: I should also add that the 70 series being such an awesome vehicle (I will take one over a defender any day of the week), market price dynamics would be more closer to the Defender than when compared to regular vehicles on the market.