From "Law and Order" to "CSI," not to mention real life, investigators have used fingerprints as the gold standard for linking criminals to a crime. But if a perpetrator leaves prints from different fingers in two different crime scenes, these scenes are very difficult to link, and the trace can go cold.
They tend to have different fingerprints for the same reasons they will have differing birthmarks.
I’ve known of identical twins with different genders.
Part of what makes a human’s in the making not the blueprints, one feels.