a horse of a different color
noun phrase
        chiefly US,  informal      
      
                                
                                
              
          
                                                      : a very different thing or issue                                      
              
                             
That's what we'll do when he gets here. But if he doesn't show up … well, that's a horse of a different color.
                         
                
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  Merriam-Webster unabridged




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