There shouldn't be any difference in 'tightness' or 'groove'.
One thing to be careful of is the Pad Volume sliders that overlay the Pad Names in Graph Mode. If you use these to mix levels on your kit, make sure you reset them all to max again after you export midi. The reason is that the volumes are taken into account on the midi export, but are then re-applied on receiving midi. This could be an explanation for the difference you're hearing.