I was at the wreckers (again
) and i saw a few interesting things.
There was an aussie ca20e and it had a hot wire type afm with a 4 pin plug and no air temp sensor in the airbox
There was a nz/jap ca20e and it had the flap type afm and no temp sensor
there was a jap ca18de and it had a hot wire afm with 4 pin plug
There was a ka24e with a hotwire afm and a temp sensor in the airbox, BUT it only had 3 pin plug on the afm
I did a measure up and the ca18de and ca20e hotwire afm are the same but the ka24e is about 5mm larger diameter which is a significant increase.
I got the black electronicky box off the top and tried to fit it to the ka24e afm but it is a slightly different shape.
I have been looking at the ca18de wiring diagram and ecu and i have discovered that yu can also run a 3 wire afm on the same computer if you dont run a catalyic convertor.
I believe you could easily run a ka24e afm on a ca20e but you would need to get bigger piping and possibly get noss to remap your ecu.
Also, if this pic works, its a ka24e throttle body i grabbed, you can see it dosent taper down like a ca18de one and is a bolt on and runs the same tps sensor.
I havent seen a aussie throttle body for a ca20e but in nz they have a twin butterfly thing that has a small one and a larger one which are pretty restrictive. From a quick look it looks like it would bolt on.
http://www.geocities.com/fraz_rips/ka24eafm.htm