Short answer...no.
The brakes will drag when you carve a turn (or even worse, off a jump), the catching will not only be annoying, but will bend the brake in all sorts of different directions and will eventually cause the brake to fail (snap in half pretty much).
I wouldn't buy them before contacting rossi and seeing how easy it is to order the smaller break and how much they are, you might find that it would end up being cheaper buying the L size for somewhere else.