Two Convertibles with some similarities, but otherwise different in most aspects such as the model year, modifications, horsepower, ground shadow size, height, fuel economy, and maximum occupancy. First of all, the is 4 model years newer than the . Also, the 2022 4 Series M440i Convertible has a more powerful engine and gets 2 mpg less than the 2018 4C Spider. In addition, not only 4C Spider is significantly smaller, but it's also shorter than the 4 Series M440i Convertible. And then, there is a difference in the number of passengers; the BMW 4 Series M440i Convertible seats two more the Alfa Romeo 4C Spider. Among similarities are the body structure, market segment, and starting price.