In my humble opinion say that Vicky is the opposite of Felicia, is like say that a battle tank is the opposite of a battleship. They are different weapons, with different purupose for different scenarios; even if both of them have cannons, diesel engines and are made by steel. At the same way Felicia and Victoria share some (very superficial) similarities, but they are different characters, with different mindset, different purpose and different role.
Does this mean they are opposite to each other? No, simply they are different or (if you prefer) yes, they are opposite to each other like they are opposite to Rosalind or to Veronica.