The OP doesn't list a location, so I'm going to assume they're Canadian. Rangers of Canada in 2010-2012(I believe) were offered in Sport trim and Off Road trim. Memory is rusty, but I believe the Off Road was essencially an American Sport 4x4 model with Rancho shocks and different seat upholstery. All 4x4 models had tcase and fuel tank skids. All in all, that's the only difference....shocks and fabric.
Like I said, I'm very rusty as I last recalled this info in 2010. I seem to remember a 2010 FX4 Off Road model exclusively for Canadian market. Last year of Fx4 in the state was I believe 2009.