They are different in substance.
This Wisconsin lawsuit was a taxpayer harm lawsuit.
The lawsuit from Missouri might have better luck (it is trying to argue MOHELA was harmed as a servicer). The district court said that MOHELA is separate from the state of Missouri, so denied the suit for lack of standing, but the appeals court might feel differently.
MOHELA doesn't seem inclined to file a suit of its own- Missouri had to file a request for data from the company to even make the argument of harm.