i think there might be a difference between front rates or ride height (springs are marked with green and red paint) but i only got one front and one rear measured.
i'm running kings at the moment, rates for them (according to king's) are:
my next springs will be 6kg/mm front 4kg/mm rear, but i keep changing my mind as i have adjustable swaybars too, and might be able to go down on spring rate.
6/4 is pretty good on the street though, and that is with fixed unknown rate shocks, adjustables should help lots.