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What an odd specimen. It almost reminds me of some type of Magnolia. Maybe a close-up of a branch cluster would help. And I think that the yellow patches are just variegation. They look way too defined to be anything else.
I wouldn't think they'd survive very long in almost no light, but maybe they would just grow and have mostly green foliage? Down here in Florida, Codiaum/Croton's are used as landscape plants in full sun, which brings out the beautiful colors.