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According to several sources I've seen/read/heard, the Op Amp is only a tiny part of the overall sound of a distortion pedal, to the extent that worrying over which one is in there is pointless. The presenter of CS Guitars on YT makes this claim, as I believe, does Josh Scott who fronts the JHS channel, also on YT. Both of them have stated it's the rest of the components - along with the Op Amp - that makes the character of the pedal, and simply changing the OA itself wouldn't make a real sonic change.
I don't know enough about circuitry to argue either way, and without definitive evidence, I say the claim in the article is debatable.