No, you need to install a driver “instance” for each device - yes it’s technically the same driver, and you can install from the same disk. Just follow the instructions, ensure all CMCs are disconnected, and attach only the new CMC as described in the “Installing TOOLS for CMC” section of the CMC Op Manual. Once the CMC is properly installed, you can re-connect the others.
In Windows device manager - Sound,video and game controllers you should see listed a separate driver instance (Yamaha USB MIDID Driver) for each CMC device.