When you download Grand theft auto lost and damned will it replace your original GTA4?

I wanted to know when the Grand theft auto lost and damned and you download will it replace your original grand theft auto 4?will you be able to only play GTA lost and damned but you won't be able to play the original GTA4 with Niko?

Can someone please let me know cuz I'm not sure if I'm finish GTA4 before lost and damned comes out?When you download Grand theft auto lost and damned will it replace your original GTA4?
no it will probably be accessed through the cell phoneWhen you download Grand theft auto lost and damned will it replace your original GTA4?
No, you will be able to alternate to whoever's story you want to play- it won't make a difference to your current game.

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