know chalk from cheese

To be able to tell two things apart (especially by recognizing their differences). Of course I know which twin is which, I know chalk from cheese, after all! Leah has a beauty mark under her left eye, and Deena doesn't.

Common Names:

Name	Pronounced	Usage
Alina	ah-LEE-nah (German, Italian, Polish)	Romanian, German, Italian, Polish
Jodene	JO-deen	English (Rare)
Gavrel	-	Yiddish
Kanchana	-	Tamil
Cephas	SEE-fəs (English)	Biblical, Biblical Latin
Keturah	ki-TOOR-ə (English), kee-TYOOR-ə (English)	Biblical