The 2307819-4: The SMT tails and bottom-or-top-entry shell let you route the board stack with the receptacle on either side of the PCB.
What the 2 A rating and gold plating mean on the board
Tin at the solder post keeps the board-side termination cost-controlled. The 2 A per contact rating is the ceiling at 25 °C ambient. In a dense board stack with limited airflow, derate per the AMPMODU derating curve; the LCP housing carries UL94 V-0, so the connector itself does not propagate flame inside the enclosure.
