The 1-2842250-4: The 0.079" row spacing matches the pitch, so the contact grid is symmetrical; your PCB layout can route traces between pads without necking down to sub-0.2 mm widths.
Compare this to a tin-plated sibling in the same series: tin contacts are good for maybe 50-100 cycles before the plating wears through and exposes the copper alloy, risking fretting corrosion. The gold here buys you reconnect reliability in a panel that gets opened for maintenance or reconfiguration.
