The early 4x4s with the older dash also have other differences to the 2wd.

The early 4x4s came with the older 2wd top half of dash but have the same lower half as the later 4x4s.

All 4x4s have petrol flap that is released from inside the car - no key. Also the boot lock is not a push in type on the 4x4s they are also released by either the key only or via a pull cord inside the car.

I dont think there's much else that differs.