[Idiom] to cost a pretty penny vs to cost an arm and a leg

ChessEnthusiast

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Is there any effective difference between these two expressions? If not, can they be used interchangeably?
 
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Skrej

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Re: to cast a pretty penny vs to cost an arm and a leg

the 'penny' expression strikes me as rather old-fashioned.

Well, that's inflation for you. :-?
 
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