ROA3 is based on the 3rd edition of the rules set, and Drakensang on the 4th … There have been huge changes in the system, so one cannot really compare both with one another.

Another point is that Radon Labs changed the 4th edition rules a bit to make them more accessible for the game.

For example, theregeneration of both health points and astral points just isn't there in the pen & paper rules.