The study of novel manganites, where the tailoring of the Mn formal valence state on the B site is done by the ordering of different cations on the A site of the ABO3 (B:Mn) perovskite structure, instead of the traditional substitution of divalent cations (Ca, Sr...) for trivalent cations (La, Pr...) on this site, can bring new insights in the understanding of the complex interplay between charge, spin, and orbital ordering. Recent reports on the mixed valent[NaMn3]Mn4O12 have interestingly shown that Mn3+/Mn4+ charge ordering (CO) is probably different than in the conventional R1/2D1/2MnO3 manganites, where the existence of CO anyway remains controversial. The comparison we propose between magnetism/structure correlation in [PrMn3]Mn4O12 and that of the well characterized LaMnO3 can feed that debate with a simpler, single valent system contanig only Mn3+ ions on the B site.