Dear the PW 100 only powered early F.15's, all F.16s delivered to us were powered by PW 200 engines.
Starting from late 90's all the engines were upgraded to PW220E standard and it happened before the F.16's were upgraded to MLU standard.
For reference kindly read this article from F-16.net.
www.f-16.net
Peace Gate II
The remaining 34 aircraft were delivered under Peace Gate II. The Pakistani F-16A/B's are all Block 15 aircraft, the final version of the F-16A/B production run, and
are powered by the Pratt & Whitney F100-PW-200 turbofan. All 40 'Peace Gate I & II' aircraft were delivered between 1983 and 1987. By 1997, 8 aircraft of the initial Peace Gate I & II order have been written off in various mishaps, hence 32 remain in service and despite the embargo, caused by the Pakistan-specific Pressler Amendment (see below), are being fully supported by commercial contracts.