Don't know much about PAF vipers but, afaik HVKK F-16s are open for modification by TAI, strictly limited for the integration of national munitions/suites such as SOM family, precision guided ordnance, Peregrine IR and Merlin BVR AA missiles, SPEWS-II ew suite, and a new ew pod under development by Aselsan along with the AESA radar for F-16.
But I think your answer lies in the upgrades offered by the CCIP and how it differs from PAF specific Block 52. I know nothing about it, hence nothing to share
. Would be great if TAI and Pakistan worked for AESA radars for PAF vipers as well.