87 Renix ECM, Manual or Auto?

Does anyone know if the ECM for an 87-90 manual and automatic are interchangable? The part number (or what I think is the part number) looks to be the same on both. Found this, but no useful info http://www.naxja.orgforumshowthread.phpt=58666&highlight=ecm+part+number.

Oh, and any good sources other than eBay?

If I'm not mistaken, the ECM is the same. On the autos they have a separate transmission control unit.

I know there is a difference in the A/C and non A/C. I've never owned a stick XJ.