In this case I wouldn't be too worried about getting parts for the PPQ. The PDP is an updated PPQ with the main changes being grip texture, sights, and being optics ready.
I have owned a PPQ for several years and bought a PDP compact when they came out for the optics cut. I can swap most of the parts out. Same barrel, recoil spring assembly, magazines, and I believe triggers (different triggers). Slides swap back and forth, and between my friends match version as well. I do notice that Walther now no longer lists parts for the PPQ, but when the PDP released they had info on their website listing the common parts. the only thing I had to get for the PDP was a new holster. They made the slide wider to support the optic.
Both are fine pistols, but given a choice get the PDP. It adds the option of adding an optic though it works fine without it. And they were smart enough to give it Glock sight cuts. Lots more sight options available. FWIW, these are the only striker fired pistols I haven't felt the need to modify the trigger.
If you already have the PPQ, rock on. No real need to switch unless you want to add an optic
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