I have already asked the same question and I was informed that Pakistani Pilots have been flying UAE F16-Blk60 for last several years. So these planes aren't new for us. PAF is already at home with these birds
Its mostly hearsay.
Had this been the case, the PAF would not have had 8 or so pilots in the US undergoing conversion on blk-52s currently (they have been there for a few months now).
Lets try not to over-exaggerate own capabilities. Everybody has to learn and do so constantly. Every time gents here put out claims of PAF having everything under their belt, they are actually undermining the image of the PAF and setting themselves up for a disappointment.