Both cars are 250 California spyders, the one on the left looks like a SWB (1960-1963) and the one on the right a LWB (1958-1960). The fact that the one on the right doesn't have bumpers has got nothing to do with whether it's a European ot American car. My guess is that this car has racing history in American sportscar races, which is why the bumpers were removed.
__________________
|