Two Pickups with more similarities, such as the body structure, ground shadow size, height, and maximum occupancy, than differences, like the powertrain, starting price, and horsepower. First of all, the 2018 Nissan Titan XD Regular Cab Diesel produces fewer horsepower than the 2018 Ram 3500 Regular Cab. Also, there is a $3,695 difference in the base MSRP. The 2018 Titan XD Regular Cab Diesel has a higher starting price than the 2018 3500 Regular Cab. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.