Pakistan-specific export version, i guess. With usual caveats - no core chinese secrets(comms, IFFs, war frequency blocks), Pakistani integration (comms, war frequencies, IFFs) and adaptation(whatever customer asked for - from english on interfaces to carpet at the entrance).
There is often a misconception that all export versions are monkey versions. It's more often than not is not the case - only Soviet Union(Russia much less) played this game a lot, because it didn't really trust most of its pact allies, and even less - its outside clients. That made parallel development of less capable blocks(which was about as expensive as main development, mind you!) worhtwhile.
In Chinese practice, PLA likes to hold off some equipment from export altogether, but otherwise customers can(and often do) specify equipment in way more rich versions than PLA itself.
