the original 575 from 1988 was the precursor to the 576 and 574. the japanese reissue cm575 was made in the late 90s/early 00s. then the current uk made 575.
the "other" 575 is technically called the mt575 (mountain trail), and is a trail running shoe that was only available in japan/asia in the early 00s. soon after a made in uk version came out in the mid 00s, but they dropped the "mt" prefix. during the late 00s, there were both uk and asian made versions simultaneously.
there is also a 3rd 575, which is a recent lightweight running shoe with Cush midsole.
there is even a 4th 575, which is an all black, leather old man's walking sneaker with velcro
it can get pretty confusing with the same name used on several models...which is part of the reason why they've used more "names" instead of "numbers" lately