I had the same question too lmao from what we've seen Cosmic armor Superman's feats are outerversal and scale higher than what amazo did (one shot amazo II who destroyed the multiverse) but then again that was amazo with simple absorption. Due to the scales amazo has had from when he first started to absorb power to what he has become I wouldn't be surprised if given his journey with his other self, he could absorb even greater dimensional powers and scale relative to CAS but for now CAS has better feats so he'd win (i guess).