Pretty much all the same. You mention the side profile being different- the US cab has the 'bulge', whereas the UK cab just curves over at the top.
Other differences:
UK cab is thinner at the front of the footplate (see side profile).
UK cab has an Atari sound amp- US cab has Sega amp.
UK cab has stripe sticker and oval sticker- US cab has stripe only.
UK cab has wooden shelf inside coin door- US cab just has coin box.
My UK cab has flexible marquee and glass cover- US cab has plexi art and no glass (not sure this is always the case though).
Plastics, pedal assembly, control panel assembly all the same.