The 1-794073-0: The 0.163" (4.14mm) pitch on both rows sets the board footprint — this is the same pitch as the Mini-Universal MATE-N-LOK receptacle, so the mating pair aligns without mismatch. The dual-row layout, 8 positions loaded, gives you 4 circuits per row for signal or low-power distribution. In a panel or enclosure where the wire bundle gets tugged, that lock keeps the header planted.
A shrouded 4-wall header with a locking ramp — the ramp mates with the corresponding latch on the Mini-Universal MATE-N-LOK plug housing. The shroud also protects the male pins from being bent during handling or blind mating.