Pakistan can build the bomb, and the reactors for high grade Pu. That doesn't mean they can make a thermal reactor which has many different and difficult challenges. The metallurgy to make a high pressure reactor vessel for 500 MW is quite different from making a quickly refueled open pool reactor.
In fact, most western countries' reactor designs are derived from US licenses.
Pakistan can build the bomb, and the reactors for high grade Pu. That doesn't mean they can make a thermal reactor which has many different and difficult challenges. The metallurgy to make a high pressure reactor vessel for 500 MW is quite different from making a quickly refueled open pool reactor.
In fact, most western countries' reactor designs are derived from US licenses.