Hi,
Here is what I found on ebay:
kdx CDI, eBay Motors, Kawasaki items on eBay.com
You can access the database at the Kawasaki Parts section of Babbitts here:
Babbitts Sports Center | Arctic Cat OEM Parts | Can-Am (Bombardier) OEM Parts | Honda OEM Parts | Kawasaki OEM Parts | Polaris OEM Parts | Sea-Doo OEM Parts | Ski-Doo OEM Parts | Suzuki OEM Parts | Yamaha OEM Parts
You don't mention the year but you can use that look up tool to check part numbers between models - if they are the same I would same they are interchangeable. If you have a Kawasaki shop in your town, or nearby, give them a call if there is still doubt.
Hope that helps
Dodge