What is the possibility percentage for RMCF to face FCB in UFEA champion final after finishing group matches ?

If RMCF and FCB finish group matches first I want to know what is possibility for them to face in final champion league I know it less than 10% but I want it exactly this question for clever people only plz help me fast and thanks for reading|||As long as they don't meet in the knock out rounds, they have a very good chancd