17 Fire Ball - 17 Mach IV question

KDX

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I've read that these two calibers are identical. Is it true? Could you go buy 17 Fire Ball ammo and shoot it in a rifle that is chambered for 17 Mach IV? Would the 17 Fire Ball dies work for reloading the Mach IV? Thanks in advance.
 
http://www.6mmbr.com/17wildcats.html

17callineupx580.jpg
 
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