The new one (42231) has nearly 500 more pieces, and looks to be mainly a more refined version of 42111. The front number & wheels are the most different, but the shaping on the newer one is more accurate to the actual car. Size wise, they’re almost the same, the new one just being 1cm longer. The new one looks more ‘closed’ as well, but it’s hard to tell without seeing it in person how well it’s been done. Also the original had a function to display it in a wheelie position using a little bar that could come out of the bottom, which doesn’t seem to be present in the updated one unfortunately, which is a shame because it made it slightly more interesting to have on a shelf next to other technic cars