No... Daxamites. They've got the same powers and such under a yellow sun, but lead can kill them if they're overexposed. They lived a couple space sectors away from Krypton. I think in their history they colonized another planet because they basically had their own way of doing things and knew Krypton was going to explode within a few centuries. Kinda how the Controllers are offshoots of the Guardians of the Universe despite looking so different. 

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