Computer compatibility?

afbryant

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I have started looking on the web for a PCM for my 2004 V6. On the label of mine, it has:
4W4A-12A650-ADA
HBO-331

Some of the Ebay sellers have written that the HBO-XXX numbers have to match, while some have it that that code does not matter. Some of the sellers have PCM numbers that will interchange, but they are different from one listing to the other.
Is there a website that might explain it, or does someone know what I need to be looking for. Also, is there a way to tell by the codes, if the PCM came out of a 2003, 2004 or 2005? Thanks
 
I am guessing that 3W4A is a 2003
4W4A is a 2004
5W4A is a 2005,,etc
 

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