What is the compatibility of the ECUs for the Z31?

To replace a 1986 ECU (or upgrade to '87?) ...what needs to be done to put the 87 in there. Are 1984-86 all the same or is '86 unique?

if this information already exists on a website, I would appriciate a link.

http://www.zheritage.com/index.php?page=leansurge
or
http://z31.com/oboard/archives/view.pl?53

or

http://www.redz31.com/pages/fuel/ecucompatibility.html

or

http://www.redz31.com/index.html

Maybe these will help??

yes thank you. I think I found the info I need in those links