Well, first of all you wouldnt need to administrate them, since the puppet would do that for you. That of course means that you are giving away controll. Other than that they would be able to utilize all the manpower and resources, since they got a core on their territory (otherwise you couldnt release them in the frist place).
That said, there most likely wont be releaseable puppets for France, just like there wasnt in HoI III. The african colonies are abstracted under direct controll by france. Atleast from what we have seen in World War Wednesday if a country doesnt exist from the start of the game or is part of a national focus (like croatia for example) you wont be able to release it as a puppet since it's cores dont exist. There wont be custom clientstates like there was in EUIV aswell. Atleast not on release.
