Well, they shed differently - corns tend to glide out of their skins, leaving a long white 'body stocking' festooned about the viv; royals scrunch themselves up in a hide and leave the rolled up 'condom' thingy we usually encounter.
I've had good and bad sheds from both corns and royals - but both types of snakes nearly always manage to tear off their facial skin from the rest of the shed before getting down to it, so that I end up rummaging about in the aspen for their lost specs, awkward little gits!