What parts interchange between a 78 and 81 kz650?

Like the title says, what parts interchange? I would like to salvage all the parts that usable parts off of my parts bike and send it down the road. The 78 is the good bike and the 81 is the parts bike. If not much will interchange, what years do?

Fuzz...You supply me with factory part numbers and I can get You the rest of the info from My Kawi cross reference program and email it to You...or even post it here....