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Is my ECM/PCM blown? And are they the same thing?

(2001 Chevrolet Monte Carlo)
in Arkansas City, KS on May 19, 2014
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!
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