I don't know where you get this
GM HEI modulates the current to the coil, that is, current limiting. The Mopar box does not. I'm not talking here about the switching action which actually controls the spark formation.
Both boxes "control" the negative to the coil, IE switch the negative. This is NOT the same as "current limiting"
There is NO doubt that removing the ballast from a Mopar system will result in damage or failures if driven on the street "long enough"
There is NO doubt that even with a factory Mopar coil, hotter output results with an HEI module and no resistor.