Motorway is not a term to be used on purpose, it is generic and standardized, motorways and expressways are different, just as highways have different set standards. Pakistan also have expressways with different lesser standards.
"Motorways of Pakistan are a network of multiple-lane, high-speed, controlled-access highways in Pakistan, which are owned, maintained and operated federally by Pakistan's National Highway Authority". Other facilities are also required to put it in the category of Motorways.
Expressways have less control and restrictions, like a bike or a smaller CC vehicle can be allowed in an expressway but not on a motorway. It is not that Motorways are called Expressways in India.
Pakistan 2017 figure is actually 7 million NGV's.