If they have the same part number then they are the same heat range, same resistance (none) and the same shape, thread pitch, insertion depth, etc.
Your engine would never know. For that matter, you could mix them up with Boschs, Berus, Densos, or any other plug with the same heat range, resistance, tip extension, thread depth, etc; and your engine would never know or care.

Kinda like mixing 3 quarts of Pennzoil and 3 quarts of Valvoline in the crankcase - no harm no foul.

DG