Results in Groups A and B mean that Jamaica is guaranteed a spot in the quarterfinals regardless of the outcome of this game. If it loses to El Salvador, it will slip (most likely - since Mexico is expected to beat Curacao) to third in Group C, but it has enough points (four) to be one of the lucky-losers entering the knockout rounds as one of the two best third-placed teams from the group stage.
A draw would see both Jamaica and El Salvador through to the quarterfinals, with El Salvador (unless Curacao does something very surprising against Mexico) qualifying as one of the best third-placed teams.