Simple answer, don't waste your time, keep your car the way it is or just get another car the shape you want. The bits don't just swap over from one to the other.. You will have to cut out and weld on the whole front radiator support to allow it to fit the AE71 shape front end.
The difference between the early and late front ends.
The bonnet
Guards
Front apron
Radiator support
Grille
Front bumper bar
Headlights
Indicator Lights
I think you will find there is no such thing as KE71 in australia, most likely that the difference on the firewall is KE70 as opposed to KE70E?