It actually isn't the TV version of Twilight at all. The Vampire Diaries is based off a completely separate book series that was written WAY before Twilight was written, let alone made into a movie.

The vampires are different, the story line is completely different, the only thing they have even remotely in common is that a vampire falls in love with a human.

I don't know anything about Vampire Diaries the show but I read the book and I was a big Twihard for a whole so yeah....not even anywhere close to the same thing.