Buying a used ECU

Does anyone know what the Right Hand dash ID# means? The ECU I am going to buy says its compatible with my car but they say to check the id and make sure. The numbers match exactly from my ECU to the Used ECU.
Is there an id I should look for other than the one on the ECU?

TOYOTA COROLLA 2009-2009 Elec Cont Unit (ECU); (RH dash), ID# 89661-02M90 51740