MoM is Wild Mana 9.0. It is still recognizably descended from FFH2.
It is mostly the same as WM8.x in content but with some significant changes to some game mechanics, especially the magic system. I won't go into the magic system changes here.
It also changes the improvement system some. The basic effects of the various improvements are the same, but often a bit stronger. You can build some of the ones that used to require a resource to be built on a plot on plots without them, and in that case it can spontaneously discover a new resource much like mines can (example: build a pasture on a plot with no resource and it might eventually create a sheep or horse resource on the plot, giving you the extra benefits of that). On the other hand, you don't want to build as many (and there is a limit that is somewhat enforced, but can be gotten around) because if you build too many they cost money to maintain. They can also have some other bad side effects, like cottages and the things they grow into cause unhealthiness in the nearby city.
It also adds some new "stockpileable" resources - they are produced in some amount per turn and accumulate until used much like the money does. These include mana, used for arcane magic, and piety (I think it is called) for the disciple units to use for their spells and such. There is also stone (mostly for producing buildings faster), wood (archers and some other thigns like palisades), leather (don't remember for sure - possibly speeds recon unit production), herbs (or whatever it is really called - the little leaf symbol - which speeds production of spellcsters), and metal (mele units). These speed the production of various things and are needed for various other things (example: to get the bronze weapon effect added to a unit you have to have some metal, not just access to copper).
The AI has also been updated to use all this stuff, and made smarter in general.
All of this is mentioned in various other places in the forums, and more (and probably more correctly).
But my point is that while there are all these things that are new, the bulk of the mod is pretty much the same as the last version of Wild Mana. It has mostly the same civilizations, leaders, units, religions, buildings, terrain, resources, world spells, etc.