If you're driving your car right now with the stock booster in place without the vacuum assist please don't thing it's the same thing. It isn't even close. There are parts inside the booster that need to be removed and/or modified to achieve what I'm talking about. I only know this because we had to do this to a friends CRX race car 20+ years ago when his booster developed a significant leak. Overnight we gutted it and I made some metal parts to replace some rubber stuff in it. The next day he said it had the best brake pedal feel EVER... even though it wasn't exactly legal. We also left it like that for the rest of the time he owned the car.
The only thing removed from my brake setup is the vacuum from the original engine. The pedal was very stiff, but worked well. One day I opened the brake fluid fill canister and since then my pedal has been a little spongy. I probably need to bleed the lines to get the stiffer pedal back.