Springs of the same rate but different heights will react exactly the same unless the shorter spring reaches coilbind where the longer one wouldn't. The shorter spring is likely lighter weightwise though, and a good percentage of that is unsprung mass, so there is a small theoretical advantage to running a shorter spring if it is lighter than a longer spring and you don't reach coilbind throughout your travel.

If the driver is saying it's way different feeling, run the corner through it's travel with the short spring on it and see if you're getting coilbind.