J-16s can not be exported to any third country. Its been covered here before and I have cited publications commenting on exactly that.
Explain kindly how to diversify weapons and radars on the JF-17? Common sense would dictate that you simplify a supply chain for the same equipment. Older JF-17s would be upgraded with the same weapons and radars/ecm/ldps etc as the later blocks.
Diversification, lets say or radars from China for eg, from the same supplier also means that both systems would be susceptible to similar threats since the are originating from the same country/company and hence are either just versions of the same base design. Hence diversification for end users really happens with platforms and systems that originate from different companies/countries.