Am I just silly?

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83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i
I found a buddy willing to give me his 2001 protege that's auto, but if I were to take the 5 speed from my local junk yards protege5 and used that protege 5 harness and ECU would it theoretically work?
 
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