The differences in the kata's I have learned in matsubayshi shorin ryu and shotokan are basically the length or depth of the stance. And Shorin ryu being Okinawan bases uses some different terms for the same technique. Other than that both pretty much stress equal use of hands and feet. Katas are similar with shorin ryu using the older Okinawan names (ex Pinan, Naihanch) while shotokan uses Japanese names (Heian, Tekki). And where you might see a cat stance in shorin ryu it may very well be a kokutsu dachi in shotokan.