I am curious as to Campac modules. Are the 9C and 9Z Campacs the same?

I have a Campac from my 9C but it will not work in my 9Z even after erasing it with toolpac.

I also have a 64k campac that will intialize in my 9Z, but I can not access any of the extra models. They read "not used". If I copy a model to one of these, it will copy. Once I turn the radio off and back on, it wants to re-initalize. this same Campac when used in the 9C goes straight into a service menu.