Yessir! I have both sizes in gold with me here, 704 and 703. If I visually compare the loose parts side-by-side, the size looks almost undetectably different to me. But when either of the crowns is physically installed on the watch head, it's a totally different ballgame! I noticed the two crowns suddenly look so different in the way they sit.
703 becomes much more tucked in like you say. It looks so much 'better' on this TC case, so I can imagine how doubly-good the 703 pays off on ST case.
On screwing a 703-8 crown onto my stem for the first time the crown broke (springy/ clutchy bit just came loose in my hands). I'm not sure if I just didn't file the stem finely enough when I was sizing it up or something, but it meant I did a quick inexpensive purchase of a 704 to tide me over - keen to wear the watch.
I didn't know about the size difference so I was looking at my watch thinking, ah-ha why is this 704 sticking out a little, is my tube fully seated correctly - did I change that and not remember rescrewing a new casetube or what, has something else changed - what is going on here haha. I'd love to buy this watch a working 703-8 again ASAP - Really worthwhile and attractive-looking.