The Spiteful wasn't just a Spitfire with a laminar flow wing, it was a completely new plane. Maybe they were as similar as the 109E and the 109F. That's not a reference for relative performance, and neither will be Typhoon/Tempest nor P-39/P-63 nor P-40/P-51.
Try looking at size, weight, surface quality and plane particulars instead of the airfoil for the XP-47F.
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