When you say same lenses, what are they? If they're 'kit' zooms of the same focal length and same max aperture, I see no reason why Nikon ones would be worth the extra money.
The Nikon "kit" lenses are probably worse. They are the worst lenses I've ever encountered. Nor are they made by Nikon so don't be impressed by the logo.
Are you referring to the Nikkor lenses?