Dunno for sure but if I wanted to know, I would go to kawasaki.com and look at the ignition systems for both bikes. This get complicated so pay attention....
You have either an electronic ignition or points. This requires ~4 Ohms resistance at the coils. To get this impedance, you must have ~4 Ohm coils (folks generally call these 3 Ohm coils) OR 2.5 Ohm coils and a 1.5 Ohm ballast resistor. The power will come off your fuse block and through the ballast resistor and then over to the coils via a circuitous path. If you have a bike with the 2.5 Ohm coils, you must use the ballast resistor to get the primary impedance up.
OK... Say your donor coils are 4 Ohm. How would you know? Either measure their primary impedance OR look for the ballast resistor. It will be a white piece of ceramic about 3" long mounted on the battery box or between the frame members near the horn. If you find the ballast resistor, you have 2.5 Ohm coils. If you don't then you likely have 4 Ohm coils.
If you want to use these coils on another bike, you have to know what you have and can't use them without the ballast resistor as well, if they are 2.5 Ohm coils. If they are 4 Ohm coils, install them without the ballast resistor.
Well? You asked why ehehe... probably would have been easier to go look the bikes up on kawasaki.com rather than type all this.
