I have a 2004 V6 Explorer does a 1994 V6 interchange
No it will not work, the engines are controlled by two totally different computers.
Two different engines. The 94 is a OHV engine and the 2004 is a SOHV engine. As Rowefast indicated the electronics are different. There are at least a half dozen pin-outs on the 2004 which aren't available on the 94 PCM.
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