The Chat system is linked between Champions Online and Star Trek Online.
The Mail system is also linked.
Yet the stipends are specific to one game or the other.
It seems to me that it would boost the subscription rates of both games (and give an extra incentive to F2Pers to subscribe) if the stipends were cross-game. That is if the C-Points were simply generic, like those that are normally purchased, and allowed purchases through the C-Store on either game.