Hello @mirko.bruhn,
We can’t bound ourselves to one single way of defining Reward. In lecture video, we saw an example that reward is state-dependent and rewards are constant. In the case of Lunar Lander, reward is calculated based on the change of states. They are different.
Here is a relevant discussion that also links to another relevant discussion, and I suggest you to read them before considering how you would like to “exit” this question.
Cheers,
Raymond