Sram XX1 crank arms

Recently purchased a Sram XX1 groupset for my Giant Trance X 29 1.I purchased the wrong chainset as I require a GPX bottom bracket.I have now purchased the correct chainset.My question is I was thinking about keeping the original chainset and using the chainring as a spare and the crank arms.Are the crank arms interchangeable between bottom brackets,or is it best just to sell it?
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But from the info provided I would say the cranks are nor usable but the rings might be. Measure the BCD.
Parktools :?:SheldonBrown
Parktools :?:SheldonBrown