Sort of. But technically no.
Basically Kyurem's DNA is split with Zekrom/Reshiram, while they are only different formes of Kyurem really. This is not the case with Mew and Mewtwo, whose DNA is very similar to Mew's, though are considered two separate Pokemon. This implies that they are alike, but are not counterparts to each other.
A Pokémon created by recombining Mew's genes. It's said to have the most savage heart among Pokémon. ~ Mewtwo's Pokedex entry
This legendary ice Pokémon waits for a hero to fill in the missing parts of its body with truth or ideals. ~ Kyurem's Pokedex entry
Judging by this, they are set apart by that.