Is there difference between MC for power vs manual?

I am trying to determine if I got the right MC for my drum to disc Scarebird swap.
9in front drums went to disc, while keeping rear as drums. Having some issue now getting the brakes to feel "hard", instead of soft. When I researched what I needed I was told 1973 Dart would get me the correct MC for my 66 Dart slant. So I got the Dorman M80266, which had the 15/16 bore and dual well (one big , one small). I do not have power brakes, however this new MC states for Power brakes, it also states that it will only fit cars with rear disc (which I dont have).
So long question, but is there any difference in the piston action of a MC that says it is specifically for a Power system vs an MC that says it is for Manual system?
I made this list, that I thought was basically all the same MC, but perchance I am mistaken?
Dorman M80266
Raybestos MC36406
Centric 130.63017
Cardone Select 131571
Right Stuff DBMC15
BrakeBest Slect NMC11145
NAPA NMC M2122

Any thoughts?