That is true and you get different results because of methods used, PH of the water after the grain is added and what method you use to sparge etc. Get Beersmith if you want to play with recipes as it is the easy way to find out what happens when grains are added or taken away. The program displays all the needed information as you play with a recipe.
Fermentor 1: Bill's House Ale II, Fermentor 2: German Helles, Fermentor 3: Bill's Schworzbier (Black Bier)
Tap 1: Bill's House Ale II, Tap 2: German Hefewizen, Tap 3: Nut Brown Ale
Future Brews: Stone IPA Clone, Blonde Ale, Budvar Clone, Newcastle Clone
New toy: Blichmann 27 gallon fermentor
If you find yourself in a hole, the first thing to do is stop digging
Good judgment comes from experience, and a lotta that comes from bad judgment