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According to the Walther forums, Yes they will work, there was some compatibility with the early p99 mags working in the PPQ but they have since been redesigned. And this promag is based off the newer design, so it will work as well as any promag works (promags in my experience don't work well for any gun) https://www.waltherforums.com/threads/p99-and-ppq-m1-magazines.82242/

Jimmy, yes Sir, this will work no issue. Also, ProMag magazines include a lifetime guarantee, if you ever have a problem with their magazines; simply return them to ProMag for replacement.