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It takes one to recognise one

What is the best concise rendering of the above into modern Greek? It is an expression commonly used to turn back an insult upon the head of an insulter. E.g.
-He's a right pervert!
-It takes one to recognise one.
-I can guarantee it. She's a dyed-in-the-wool-liar.
-It takes one to recognise one.
 
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