They have much more choice, whereas the UK models come somewhat fully loaded.
Individual options, including the orange callipers like the GS F and multiple wheel choices, plus a bunch of different packages including:
Premium (leather heated/vented seats, memory positions, blind spot monitor, rain-sensing wipers)
Performance (carbon roof and wing, plus TVD)
Navigation
All-weather (headlamp washers, heated steering wheel)
Most of the pics of the RC F in the US with a carbon hood are either imported parts or 3rd parties selling true CF hoods, not CFRP