It's definitely different. I used to jump too much in MK9 because of the extra damage, now I barely do it at all. At first I had a hard time landing them, so I just stopped trying so much. Plus, the damage is scaled this time, so while in MK9 it always added 3% damage, it only adds like 1 at long combos, or even nothing, and they seem to have an effect on the opponent staying in the juggle (opponent falls faster) so they ruin some combos. Though now you can juggle jump in punch several times in a row in the corner etc.