They have a different downpipe. The 6.0 DP extends to the turbo when it come up over the engine, the 7.3 DP doesn't have that "extension" The pipes should be long enough to fit to the rear but I believe that a few of the hangers are in different spots but don't quote me on that.
On my truck, my muffler delete is for a 7.3 and the hanger on the delete pipe fits my 6.0 but that's the only real world expierence I gave give you
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