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 model year and horsepower. First of all, the 2013 Sierra 1500 Extended Cab produces fewer horsepower than the 2016 Tundra Double Cab. Among similarities are the body structure, starting price, fuel economy, ground shadow size, height, and maximum occupancy.