Do they feel different?
Mmm, not really. I mean, you'll start to distinguish lots of different types of movement, from rolling sensations to actual jabs. But most of the time the jabs and the hiccups feel the same, the only difference is that the hiccups, again, are rhythmic where the jabs are less so. That, and, as baby grows, the jabs will be visible only at the spot where baby is kicking whereas the hiccups will cause the whole belly to twitch at once.