Mana/MP/etc doesn't usually equate Spirit/Ki/Prana/other "life" energies in most settings, I think. They're similar but highly distinct from each other. (and Ether/Aether can be another thing entirely, depending)

But either way it's good that TZDL doesn't inherently specify any of this and leaves it to the players. Mixing concepts from different universes/settings/communities is a messy business and why I avoided it for Jason.