These two FIAT 500 models are two variations of the same model with one major difference, the modifications. First of all, there is a notable difference in the starting price of the 2016 FIAT 500 Convertible, which is $6,300 less than the base MSRP of the 2016 FIAT 500 Convertible C Abarth. Also, although the 2016 500 Convertible C Abarth has a more powerful engine than the 2016 500 Convertible, it gets 6 more mpg. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.