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    Differences on 03-04 and 05-06 2.4 engines?

    I have a 2006 TJ with bad block, I was able to get an engine but it was for a 2003/4, everything looks the same. does any one know if there are many differences? do I need to change PCM too in order to install it. not much of a mechanic, just a project for my son. Thanks