There shouldnt be any difference. Call up any autopart store and ask them.
The gapping and plug numbers can be foudn on the emisions lable usually on the hood or on the air cleaner assembly.
You could be getting inductive crossfiring, make sure no plugs that are on the firing order next to eachother.
Say firing order is 14326 say 3 and 2 are on teh same side of the engine, and firing order together, those wires cannot be running parallel to eachother, they will have to criss cross and be separated.
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