2016 BMW 3 Series Sedan is the newer version with some differences, such as the model year and horsepower.. First of all, the is 3 model years newer than the . And finally, the 2013 3 Series Sedan produces fewer horsepower than the 2016 3 Series Sedan. Among similarities are the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy.