Its totally a new and separate sqn...but i wonder how will they accomodate so many sqns at mianwali cuz its a small airbase for this many sqns not forgetting the SAR sqn and uavs.
I think No. 18 will be re-equipped with JF-17 and moved to some other MOB and this temporary sqn will work as OCU for F-7P/PG and later as LIFT sqn.
*Just speculating*