Two Convertibles with some similarities, but otherwise different in most aspects such as the model year, modifications, horsepower, height, fuel economy, ground shadow size, and maximum occupancy. First of all, there is a difference in model years. The is 4 years newer. Also, the 2022 Mercedes-AMG C 43 Convertible has bigger and thirstier engine; the 2018 4C Spider gets 6 more mpg. In addition, the 4C Spider body is slightly smaller than the Mercedes-AMG C 43 Convertible, and in addition to that, it's also significantly shorter. And then, the Mercedes-AMG C 43 Convertible seats two more passengers than the Alfa Romeo 4C Spider. Among similarities are the body structure, market segment, and starting price.