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If the two works are not sufficiently different, then yes. I think the priority goes to whichever was the original form, so if the light novel came first keep it as light novel and either cut the manga page or make it a redirect. If the manga called first, flip the directions accordingly.
It seems pretty unnecessary for Tsuyokute New Saga to have two main pages for Light Novel and Manga. Wouldn't it be better off to just have these combined?