know which is which

and tell which is which

to be able to distinguish one person or thing from another person or thing. I have an old one and a new one, but I don't know which is which. I know that Bill and Bob are twins, but I can't tell which is which.

Common Names:

Name	Pronounced	Usage
Anthea	[æn'ðiə]
Tawnie	TAW-nee	English (Rare)
Shankar	-	Indian, Hindi, Marathi, Kannada, Malayalam, Telugu, Tamil, Bengali, Nepali
Paschal	-	French (Rare)
Regina	rə-JEEN-ə (English), rə-GEEN-ə (English), rə-JIEN-ə (English), re-GEE-nah (German, Polish), re-JEE-nah (Italian), RE-gee-naw (Hungarian)	English, German, Italian, Spanish, Portuguese, Lithuanian, Polish, Czech, Hungarian, Swedish, Norweg
Jadwiga	yahd-VEE-gah	Polish