GU and GU II Patrol 4.2 Power difference

According to the specs on Redbook the GUII TD42 which started April 2000 produces 23kw more than the GU series I. Does anyone know what was changed on the motor to produce this (its not intercooled both straight turbo). The tourqe remains unchanged. Also did the vehicles tow much differently if anyone has towed with both?

Also has anyone ever been able to buy a car for the prices that redbook suggests, I never have they always seem very low.

thanks