Die "N" Variante scheint nur die neuste Version zu sein.
Es wären also beide richtig, da beide "not for Hardtop" = Schwarz, sind.
https://www.mazda-parts.com/oem-parts/mazda-upper-molding-n243508x0n
Ansonsten gerne nochmal im Hexorcism nachprüfen:
2016 ND Shop Manual | ND Shop Manual
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www.hexorcism.com