Are 6.5 and 6.2 Diesel Engine Cylinder Heads the Same?

I have a 1994 gmc 6.5 diesel.The motor went out of it so i pulled it and replaced it with a good running 6.2.i put the electronic injection pump,injectors,turbo,crank position sensor and so on.when i fire it up i have to use the foot feed to keep it running for the first few seconds and it smokes an awful lot.any ideas

Suggestion:

of course they are not the same

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