Yes, ofcourse we can't compare sync24 with midiclock. But still, they are both 24ppqn.
I'm gonna measure my convertes and see what they do - really.
I remember reading something about Jomox or perhaps quasimidi i believe, that had to narrow pulse for older stuff to pick it up.
Oh, and the 303 will just count the pulses. So it would be as happy as normal with a screwed sync24.