The pair(s) of complexes wherein both exhibit tetrahedral geometry...

${\left[{FeCl}_{4}\right]}^{-}$: ${sp}^{3}$ Tetrahedral

${\left[Fe{\left(CO\right)}_{4}\right]}^{2 -}$ : ${sp}^{3}$ Tetrahedral (Isoelectronic to $Ni{\left(CO\right)}_{4}$)

${\left[Co{\left(CO\right)}_{4}\right]}^{-}$ : ${sp}^{3}$ Tetrahedral (Isoelectronic to $Ni{\left(\text{ CO }\right)}$_{4}$)</p><p>${\left[{CoCl}_{4}\right]}^{2 -}$:${sp}^{3}$Tetrahedral</p><p>\left[Ni{\left(Co\right)}_{4}\right]$ : ${sp}^{3}$ Tetrahedral (Complex of Mond's process)

${\left[Ni{\left(CN\right)}_{4}\right]}^{2 -}$ : ${dsp}^{2}$ square planar (Cyanide is strong field ligand)

${\left[Cu{\left(Py\right)}_{4}\right]}^{+}$ : ${sp}^{3}$ Tetrahedral

${\left[Cu{\left(CN\right)}_{4}\right]}^{3 -}$ : ${sp}^{3}$ Tetrahedral