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The transmission will mechanically interchange, BUT you will not get it work, because all programming in done by VIN. So there will not be programming available as a GM download, as GM techs would do.
Sorry to say, but better you know this now.
What year and model is the Z18XER fitted to?
With a straight swap of the correct transmission into a AH, there would normally only be a small program setup via TECH2.
Generally reset TAP cells in the TCM, a GM tech can do this for you.
Hope this helps.
I have seen many people fit wrong parts to cars that can never be programmed correctly because of a mismatch.