If you take away all things that aren't their actual own power from when they're born then change the story like that.
Sasuke's own power being the Sharingan he would still have it.
Naruto wouldn't have Kurama, but he would learn Rasengan from Minato and probably FTG as well while learning seals from Kushina.
Sasuke would still have a curse mark as Orochimaru would want his Sharingan and he would still be able to use Chidori and Kirin.
Naruto would gain Pa and Ma's genjutsu and unlimited sage mode. (I'm not sure fi this should be counted seeing as that's outside help but being a summon which is normally allowed, so I'm not sure)
Naruto still wins but stop taking away Sasuke's powers that are actually his own.
Edit: Take out the curse mark as that's outside help.