As I recall, the outside lights have dual filaments, allowing that light to stay illuminated all of the time. On low beam the low beam filament is lit, and on high beam, the high beam filament in the outside light is lit as well. This would require a three connection connector on the outside light. If this connector were to be simply connected to the single light, everything should be fine. The four headlight system simply added another high beam inside the low beam, and was illuminated by the same circuit as the high beam filament on the two lamp system.
