Two Convertibles with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the model year, horsepower, and fuel economy. First of all, the is 2 model years newer than the . And finally, the 2014 Z4 has a more powerful engine and gets 2.9 mpg less than the 2016 SLK-Class. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.