It is not really a PPQ, but it's closely related. Closer than cousins; more like step-siblings...
From the wikipedia article in the P99:
Basically, the PPQ is a P99Q with a much nicer trigger.
From the wikipedia article in the P99:
Many of the alterations found in the Fabryka Broni Radom P99 RAD variant were also applied in the Walther P99Q pistol. The P99Q is a designated police pistol, which has been certified according to the Technical Specifications (TR) of the German Police (Technische Richtlinie Pistolen im Kaliber 9mm x 19, Revision January 2008).[17] The P99Q is exclusively manufactured for German and foreign police departments and is not available on the civilian market.[18] The P99Q has a partially pre-loaded internal striker trigger mechanism that conforms to the Technical Specifications (TR) of the German Police. When the trigger is pulled, the striker is fully cocked and released, firing the pistol. Trigger travel is approximately 13 mm (0.5 in) with a trigger reset of 6 mm (0.2 in) and a trigger pull of approximately 32 N (7.2 lbf). The trigger pull is consistent in length and force from the first shot to the last. The Technical Specifications (TR 2008) of the German Police also demand an accuracy of fire for a 10-shot group with German Police certified 9×19mm Parabellum ammunition[19] at 25 m (27 yd) (R100)[20] of ≤ 16 cm (6.3 in). This equals an accuracy of fire of ≤ 22 minute of angle (MOA) or ≤ 6.4 mrad. The grip frame has an integrated mounting MIL-STD-1913 (Picatinny) rail for attaching tactical lights and laser sighting devices.
Basically, the PPQ is a P99Q with a much nicer trigger.