Ballast resistors where used to reduce the voltage from 12V to 8 volts to help stop the points from pitting when the car makers switch to 12V from 6 volts back a long time ago, 1953 to 1956.
Todays ECU act as the switch to the coil like the points use to do
I think you can use either one on your deal with the standard single ballast resistor for your ECU