point/eletronic ballast?

The OEM ignition module couldn't operate on 12 volts so that module used 5 wires and dual balllast resistor. Modern electronics allows the module to operate on full 12 volts so the half that ballast resistor and the 5th wire are no longer used. Aftermarket module may have only 4 contact pins. Some had the 5th pin even though not connected to anything inside, just to satisfy customer curiosity/avoid confusion. It can't hurt to have all the correct parts even if not used.
But the simple answer, same coil requires the same ballast resistor.