it is a very different thing, or really in a different way (see Molina); another thing entirely
Orthographic Variants:
occenca centlamantli, oc cenca cetlamantli
Alonso de Molina:
occenca centlamantli. es otra cosa muy differente, o muy de otra manera. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 74v. col. 2. Thanks to Joe Campbell for providing the transcription.