Ecu part number

hi everyone,
Just bought Nissan micra which is non start 4 reg manual, k12 engine, and been told ECU needs to be replaced, there are steady lights on the clock, started motors fine as tested and the engine turns if I connect straight cable from battery to solenoid. Is possible if ECU is faulty the engine would not turn.also went to Nissan dealers to get part number of Ecu and been given completely different number from Ecu getting from breakers, Nissan dealer part number 23710AX10D can any one help to verify part number for hitachi as there are plenty hitach start with MEC 32-40-.........
Help me guys . Sorry if my question is on wrong thread.

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Hi, everyone,
Up date did send ecu for repair same issue all lights come on dashboard n goes off, orange light with symbol States on, did call auto locksmith to reprogram , he advices that is nothing to do with key programming it's my immobiliser locked now I am confused as new key and immobilizer was replace by dealers help please! Very confused