MOC3041/42/43 differences
These all have triac outputs. Triacs have the intrinsic feature to turn off at currents below the holding current. The control circuit takes care not to turn on immediately when the voltage isn't near zero. That makes it safe to use that part as a on/off switch in a simplyfied circuit for inductive and capacitive load. You cannot control phase-angle that way, though.

The MOC3041/42/43 are binned for manufacturing tolerances of the optocouple. That's it.