I'm unsure if the 16F1704 fits into what was used on the A3 or not.
A3 and L3+ have same 16F1704, also as z9m. May be it has another adreses, or something else made another.
You investigated z9 big. Is there same VRM scheme as on z9m?
Are somebody can make good photos of A3 and L3+ hash plate?