In which of the following pairs, both the species are not isostructural?

In diamond and silicon carbide, central atom is sp3 hybridised and hence, both are isostructural. NH3 and PH3, both are pyramidal and central atom in NH3 is sp3 hybridised and in  PH3 pure p orbitals are involved, and hence, both are isostructural. SiCl4 and PCl4+, both are tetrahedral and central atom in both cases is  sp3  hybridised, and hence, both are isostructural. In XeF4,Xe is sp3d2 hybridised and structure is square planar while in XeO4, Xe is sp3 hybridised and structure is tetrahedral, and hence, both are  not isostructural