The EU directive burdens of proof have been very flexible for countries with a variety of national legal systems, because they are kind of core principles.
It doesn't matter so much from country to country how much evidence it takes to prove your point. There might be different points you have to prove. There might be different procedures or structures for how you do it.
In terms of the quantum of what proof is necessary to prove that your rights are violated, that has been pretty global. The standards are very consistent universally.