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Q: Is my ECM/PCM blown? And are they the same thing? on 2001 Chevrolet Monte Carlo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My cousin and I replaced the head gaskets on my 01 monte carlo *3.4L*and now the car wont start. The car will crank but wont spark. I've been told it's the ECM. I have also been told its the PCM...idk what the difference is or if BOTH are on the car. I know the PCM is in the air filter box. It is not throwing a code, just wont start. Please help!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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