My understanding is that those are codes for different regions of Suzuki sales, usually to clarify for different emission regulations. Greater USA, California, Europe, Asia, etc.
I will print up both of those wiring diagrams. And when raining one day will look at one or maybe both of them and compare to my current wiring. No year on those diagrams.chec fault please help may be of help. Only difference is the K4 650's not have the headlight cut-out starter switch but your K5 did.