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2002 Boxster S 2 stamped wheel sizes on same rim

Wheels and Tires

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2002; Engine (type, size, modifications): 3.2L; Total Mileage: 42,700; Transmission: Manual;

I'm looking for an extra set of 18" rims and want to remain in the M/SS (Showroom Stock) autocross class. I've found a set but the rears have two wheel sizes in the casting. One (my desired size) is 9Jx18-ET52 "B". The other, immediately below is 10Jx18-ET65 "A". Can you explain the contradiction? Thanks!

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