I think I have seen PAF f-16 with an indigenous missile hocked up in it.In terms of flight performance Pakistani pilots put jF-17 equivalent with F-16.
BlkIII is expected to have AESA radar as a major upgrade, along side HMS.
F-16 has higher payload and ferry range. jF17 BlkII already have IFR to compensate the ferry range /loiter time.
F-16 on the other hand is expensive and is limited in flexibility of upgrades. Basically, F-16 is a black box for its customers.
jF-17 has low RCS, it's low weight, modern ECM, modular in design, low cost, easy to fly, easy to service, easy integration.