Though very similar, all of these have some slight differences. Cotoletta is breaded and fried cutlets (often veal or chicken). Scallopini is normally sauteed and then cooked in a flavorful wine sauce. Schnitzel is more similar to Cotoletta as it is pounded meat that is then breaded and fried. So, though all three involve flattened meat, they all use slightly different flavors for the final dish.