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At birth my fingerprints were the same as his. Mom did that thing where she mixed us up and had to take us back to the GP for ID.
I can still unlock his phone 50-50 with my melon but not as often with the fingers.
Fingerprints are epigenetic traits. Twins usually have very similar but not identical fingerprints. They can often be confused for each other, but generally they can be told apart on closer inspection.
Can phones tell the difference?
Not so identical then eh?