Disc Conversion Question

power vs manual ...depends on your part selection.
...big piston calipers and small piston master cylinder stop almost like power brakes.
...now go with small piston calipers and large piston master cylinder and stopping can be difficult.

I've seen rebuilt KH discs for 14 inch wheels on FABO. Would I need to replace the master that I'm currently using with my drums if I don't go power?