1977 Z400 D4

Just a quick question. I have been looking at service manuals and have purchased a Kawasaki one on EBay matching my bike being a 77 400 D. The only thing is it just about all the manuals say KZ (American) instead of just Z. I now realise that I also need a parts manual. If it states KZ instead of Z are the part numbers interchangeable?

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