Can zinc(II) ions be doped into the crystal structure of l-proline cadmium chloride monohydrate?

The differing stereochemistry of the bivalent metals Cd and Zn for the set of l-proline and chloride ligands precludes the substitution (doping) of Cd(II) ions by Zn(II) ions in the crystal structure of l-proline cadmium chloride monohydrate.