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I dunno, but Kagaya seemed to be the top tier powerhouse of the series so I can't see them both taking down kagaya. I figure someone might eat the fruit ( sakura's last hope of ever overcoming the title of useless) and even the odds some.
sasuke has almost no destructive power so he gets raped by kaguya, naruto's the only capable of doing much damage to her with his tbbfrssasuke can solo
We don't know the extent of Naruto and Sasuke's powers and moreover we don't know what Kaguya is capable of.
So we cannot assume anything yet, just wait and see.