Judiciously modifying your spare firing pin with similar grooves to the fluted one you already have will not hamper operation... and should not introduce any safety issues. The original pin for your 1918 Luger would not have had this fluted firing pin, so if yours does, either it was modified by an arsenal or field rebuild, or it has been replaced previously.
I have never seen a pierced primer in a Luger, but I imagine that this mod must have had some merit or they wouldn't have required it for military Lugers.
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regards, -John S
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