I’m trying to find out the same thing about Nachlas! But as for mesores rochel, based on what I hear the girls are from very “in the box” homes and are not thinking girls. Like the type that they were raised yeshivish and so will always be yeshivish without thinking on their own of a path that’s for them. It could be I’m wrong but I’ve been strongly getting that impression.
Meohr is much less academic than Machon Ra’aya but that’s about all I know about those two.