Interesting question, my guess is it will be numberplated. The "new" PAF Fighter sqds (25, 26, 27, 28 and 50) seem to never have the very cutting edge stuff historically
Looking at history there are the very favoured "elite" units that were at PAF's birth, 9, 5, 11 and 14. These units always got special treatment
Then there were the "Sabre" Sqds PAF raised as we inducted large number of F-86s in the 50s. These are 2, 15, 16, 17, 19 and 20. These are not considered "elite" but get decent kit, in the case of 15 Sqd it got J-10C
As mentioned, the "new" Sqds raised post 1965 (22, 25, 26, 27 and 50) seem the last in line.
Obviously the selection is also effected by the fact that the older "elite" units (9, 11, 14 and 5) are or have been F-16 units and pilots and squadron commanders were naturally fast tracked and most of the CAS's of last 30 years have been Viper drivers and thus from the old units. Many often ensure that their old unit is first in line for new cutting edge kit.
Trust me, we will never see a situation where say 27 Sqd has a much better aircraft then 9 Sqd