Ariel, 
At least in Bulgaria, the terms are not interchangeable, and the yataghan was a lot more popular - all Bulgarian haiduts and revolutionaries had either a yataghan, sometimes a kilidj, almost never a khanjar, based on photos. 
When it comes to secondary weapons, the karakulaks (a local, smaller version of a yataghan) and kamas were more popular than khanjars. 
Regards, 
Teodor
		 
		
		
		
		
		
		
		
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