Baseball teams will have a manager and a general manager. The manager is the one who manages the team- match day stuff, who to sub etc. whereas the general manager is managing the club if you know what i mean- transfers etc.
Not sure it equates to football that easily, the 2 jobs are for the most part done by the manager. We're a bit different in that we have a transfer committee, other clubs have a director of football, others the owner is a lot more involved in signings etc. FSG are probably trying to see if they can bring some ideas over, but it won't be exactly the same, football teams are not set up in the same way baseball teams are (as far as I know)