I don't know. I assumed the result would be a lower ride height at the front, because the soft spring would compress more. But it starts out longer so... I don't know.
If you're asking because you think this may actually have happened, then the easiest way to tell is to compare the thickness of the wire that the springs are made from. Front springs are thicker gauge wire than rears (hence their stiffness). I don't know the actual numbers, but there's a good couple of mm difference.