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You can't get them that way. Identical twins = identical DNA = identical skin tone.
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That would be true *if* they were identical twins.
They are not. They are fraternal twins. Two sperm, two eggs, two separate DNA profiles, two children.
In this case, as both parents are mixed-race, one happened to get a set of genes for light skin and one got a set of genes for dark skin. It's not even all that shocking, in theory, it's just very jarring in practice.