I think the confusion comes from the fact that "P337" is not a valid Cessna model. Pressurized 337's are either a P337H or a T337G. Regardless, 4 registrations actually use the P337 model designator.
Here's what Landings.com has listed:
P337 = 4
P337H = 52
T337G = 195
Total Pressurized Skymasters in US Registry = 251
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