Disc brake pedal ratio different from Drum brakes?

As mentioned, the pedal and brackets are the same whether disk or drums, only the MC differs. Pedal ratio does vary between manual and power booster. The power setup requires more pedal effort (if no vacuum assist), which is why power MC's tend to have a smaller bore. That is due to the lever ratio in the power stand-off brackets. As mentioned, with either manual or power, you can decrease pedal effort by changing to a smaller MC bore.

I use a 7/8"D MC in all 3 old Mopars, 2 w/ power assist (for 95-99 Breeze, Cirrus, Stratus w/ ABS). Most here use a 15/16" D MC (80's Dodge trucks) for manual brakes, which you can buy as a ~$90 conversion from Dr. Diff. I would think front disks only or 4-wheel disks would be the same pedal effort, since with rear drums you proportion the rears down.