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the motors are the same. the cam sensor and gears are the same as well.
the used motor may have an issue. the cam codes come from possible worn timing chain, guides or tensioner. this all needs to be checked to verify there is no issue.
ok, you still need to check these items. I have learned never to assume anything.
no, not necessary. the pcm does not know you change the motor
I have done many of them. common failures are guides, tensioners and the chain itself.
it goes into a de fault mode. the pcm substitutes a know good value to make it run ok.