\(Z =\) Atomic number of the metal

\(X =\) Number of electrons lost during the formation of the metal ion from its atom Y=Number of electrons donated by the ligands

For \(\left[N i(C O)_{4}\right]\)

\(E A N=Z-X+Y=28-0+8=36\)

For \(\left[N i(C N)_{4}\right]^{2-}=28-2+8=34\)

Thus the EAN of \(\left[N i(C O)_{4}\right]\) and \(\left[N i(C N)_{4}\right]^{2-}\) is not the same.