ISOELECTRONIC SPECIES: the elements or ions which have same number of electrons are known as isoelectronic species. They may vary in their chemical and physical properties.

ISOSTRUCTURAL SPECIES: the compounds which have same shape and hyberdisation is called isostructural species.

There are 32 electrons in and sp² hyberdisation.

In also there are 32 electrons and sp² hyberdisation.

Both have trigonal planar structure, therefore they are isolectronic as well as isostructural species.

Hence the correct option is (i).