Which of the following complexes are homoleptic?

${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right]}_6\right]}^{3+}$and ${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$ are homoleptic because all the ligand which are connected with central atom are same or identical.

Hence, options A and C are correct.