Indeed, Warrior is just a trim level for the Shogun. There are three different cars that go by "shogun":

Shogun Pinin - Rival to the RAV4, CRV, Freeloader, etc, although it actually has a low-range box and will out-offroad any of them. Shame it will never be used to do so.

Shogun Sport - Previously called the Mitsubishi Challenger, this is indeed based on the L200 pick-up chassis and driveline. Thus it's not the most practical nor the most refined vehicle out there, but compared to any other middle-weight 4x4s it is a far better tow-car thanks to the leaf-sprung rear end. Same goes for the L200.

Shogun - the big boy. It doesn't have the on-road dynamics of the X5, ML or new Range-rover but it is still a genuine mud plugger. Mainly of interest to the country set I guess, ours has proven its worth on more than a few occasions.