Is The Vampire Diaries Hard To Understand After Reading Night World?

I have very recently read night world… i loved it… but i am hoping to read LJ Smiths Vampire Diaries… Is It hard to understand After reading night world?
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What Is The Storyline Of The Vampire Diaries: Night Fall?

Is this book coming out in 2009, gonna be a continuation of the previous remake of the Vampire Diaries. Or is it a different story?

Is The Night World Series Different From Vampire Diaries?

I am having trouble trying to figure out if the “Night World” is a whole different series from the “Vampire Diaries” series. Can anyone please help?