I know quite a lot about them as I've been modifying them for at least 20 yrs.
The CJ doesn't have starter boss machined and case isn't drilled for starter motor bolts.
The rear frame, seat, tail piece are different to CB, as is the fuel tank.
In Europe we had CJ250 which had disc brakes, I'm pretty sure you can retrofit swinging arm caliper from just about any CB, 1973 to 1978 (except the CB750 one)
Its ony 5 speed instead of CB360 6 speed transmission but either cluster will fit, you do have to change shift drum and selectors though.
It wont start without a battery.
The Later CB/CM 400 has electronic ignition and is totally different motor ( 6 valve, balancers, etc)
PJ