You donkey!

Of course they're not the same!

The 2wd system has a three way lower rad hose that comes off the water pump, and splits in to the bottom of the rad, and the bottom rail that runs underneath the rad.

Samco don't actually manufacture a bottom rad hose for the 4x4. The coolant kit for the 4x4 is the two top hoses either side of the thermostat housing.