My recollections from running a CB360 G5 as a student in the 70's is that most of the cycle parts and electricsare interchangeable between G5, CJ and 400/4s.
The CJs were down spec'd slightly from the G5: less chrome, five speed gearbox rather than six, and no electric start.
The footrests were moved back to improve riding position, so rear brake and gear levers are different as well.
That made them a little lighter though [And a little faster if the owners were to be believed!].
The engines are interchangeable as a lump between the 250 and 360, but the the 360 is stroked as well as overbored so the crank is different. The con rod little end dia is also bigger on the 360 and the head has a squish ring machined into it to suit the bigger bore. The 360 has a bigger size of carbs too.
I was told the pistons from a CB350 K4 could be made to fit the 250 G5 with an overbore to 325cc, but never tried that for myself.
