Meaning of “which is which” in the English Dictionary

british dictionary

"which is which" in British English

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which is which

used in expressions that relate to being able to see the difference between two very similar things or people:

For the first few months the babies looked so alike I couldn't tell which was which.

(Definition of “which is which” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"which is which" in American English

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which is which

each person or thing separately:

The twins look so much alike I’m surprised anyone can tell which is which.

(Definition of “which is which” from the Cambridge Academic Content Dictionary © Cambridge University Press)