NTK 24393 is primary 02 listed for the Gen2 on Rock Auto which is the one I'm currently running. It looks like the Gen 1 has a different part number for the primary 02.
https://www.rockauto.com/en/catalog/mazda,2013,3,2.3l+l4+turbocharged,1505571,exhaust+&+emission,oxygen+(o2)+sensor,5132