A friend of mine is breaking a 240 for parts and says i am welcome to any parts I want/need. Are any of them likely to fit a 360? I've only owned my first 360 for a couple of weeks so as such know little about either cars.
Of particular interest to me would be rear leaf spring components, rear exhaust mounts and front cross member but really any info on any compatible parts would be appreciated.

i think 240s have coil springs on the back not leaf

Yes, definitely coil springs at the rear. Engine and Gearbox are the only similar parts AFAIK, but not really an upgrade unless its a rare 16v or something.

340 is originally a Daf design with a Renault Engine, the 360 is adapted for the Volvo Engine.

Engine, fuses, bulbs and that is about it.