Plato had one consistent theory of politics; the Republic, Politicus, and Laws form a unity, complementary rather than contradictory. These dialogues are all theoretical, none provides a blueprint for political action. Political theory establishes the standard by which we must judge and thus allows us to act according to an aim.
Edelstein, Ludwig, "Plato's Political Philosophy (abstract)" (1959). The Society for Ancient Greek Philosophy Newsletter. 28.