I would think mule die clash would be WAY down the list of possibilities! Most likely scenario would be die chips and or deterioration. Better closeups will help.
Also a genuine mule coin is where one die (either the obverse or reverse dies) gets switched with another coins die and then mints coins after the switch. A notorious example of this mule is the Sacagawea dollar reverse switched with a State Quarter obverse...
On the reverse of your 1983-P nickel, those look like die chips and die wear. A die clash is where the dies ram together and transfer elements of both sides to the opposite side and can range from minor clashing to insane clashing.
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