Probably there is a difference and to see it you need to play 1000+ matches. I asked a similar question here https://forum.topeleven.com/top-elev...ifference.html. As a result, in the last game with this team, I won and took first place in the league. All these "white skills pumping", special skills, team bonuses give a small difference of 1-5%, and therefore seem to be cosmetic.