hey guys i need to buy a headgasket as the one i got is wrong.

am looking on oemacuraparts (where ive got most my parts, except for gasket kits, which i somehow managed to buy b18c ones which alot of things are different, my engine is b18b2)

i got my engine from an auto, so i looked at auto 3dr RS and the part number is 12251-p75-004

thought id look up manual aswell, same 3dr RS and the part number is 12251-pr4-004

so i went and looked at my block and head, and the block is pr4 and the head is p75

any idea which one i should buy or would they both be identical?

thanks