A quick Question... HELP!!!

I am currently lookin for an sr20det for my 89 Nissan 240sx. It has the Ka24e in it already, but its just not enough. I have found plenty of sr20's but they do not come with the computer, the question is will the computer from my ka24e work for the sr20? Or do I have to search around and find a computer?
Also, would the automatic transmission from my ka24 work fro the sr20? I want to convert to a 5-speed but it takes a lot more time. If anyone has answers, PLEASE HELP ME!!!

Thanks,
Junior T

No, they aren't compatible,
No, they aren't compatible

So, neither one is compatible?

Nope

aftermarket ecu?