Two Pickups with more similarities, such as the body structure, starting price, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the horsepower. And finally, the 2018 Ram 1500 Regular Cab has a more powerful engine than the 2018 GMC Sierra 1500 Regular Cab. Among similarities are the body structure, starting price, fuel economy, ground shadow size, height, and maximum occupancy.