a combination doesn't not consider a group of elements different if the only thing that changes is the position while a permutation does

Confusion alert! Confusion alert! That sentence is extremely hard to understand, even though I know what you're trying to say. I think one of the most egregious problems is the double negative, doesn't not. For the sake of others, I'll try to translate:

The ordering of the elements matters for a combination, but doesn't matter for a permutation.