What are compatible chain rings for a Cannondale CarD 13

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I am going to do a hilly bike packing trip in June, I currently have 52/36 hollowGram spider chainrings (Not sure on No of arms?) I want to change to a 48/30 are these compatible please?

Cannondale HollowGram SpiderRing 8-Arm Chainring on sale at Merlin cycles​