Two Sedans with more similarities, such as the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the modifications and horsepower. First of all, the 2016 BMW M3 produces fewer horsepower than the 2015 Mercedes-Benz C-Class Sedan AMG C 63. Among similarities are the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy.