Sasuke wins against any SM Naruto that is not drawing Kurama's chakra. CS2 is far too durable as it withstood a massive blast from Dedara's homing C2 bomb at the cost of a single wing, leaving Sasuke unscathed - by the way, that dot at the right of the page is Deidara's dragon:
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Sasuke is also shown to use multiple techniques in high speed combat, something Naruto is not accustomed to - here he was shown flying above at high speed, whilst using Fuma Shuriken and Chidori spear:
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Sasuke is also quite fast, as he was able to exit a large scale explosion right - all of it is not even shown on the manga page - without any damage to himself:
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So this excludes him being blitzed by SM Naruto. His reaction rate are also incredible, as he was shown inflicting seven Slashes onto a CS2 prisoner during his blitz. At CQC, Naruto is beaten poorly, given that his Frog Kata as only shown to work at less than an inch away from the path's face:
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As Sasuke is also to see Senjutsu - he trained in it himself and we saw during his fight with Kabuto that both Uchiha Brothers could see Senjutsu chakra scattered across the cave from the Snakes liquified through Hozouki Clan's technique- he isn't falling for this one.
At CQC, Sasuke's Kenjutsu rivals Bee - Naruto doesn't stand a chance here. He also dodged V1 Ae with 3T, when Naruto in SM - even the war arc Naruto - has no such feats. V1 Third Raikage is significantly slower than him. Remember, V1 Ae was punching and overwhelming KCM Naruto back, so be careful when you make yourself look stupid by sating that SM Naruto is faster.
Sasuke can also use snake summons to guard himself and latch onto objects are far off distances:
Notice where Sasuke is flying and he still manages to grab the tree to safety:
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Additional defense is provided by completely using a snake drape to avoid massive damage:
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As far as FRS is concerned, then Deva dodged FRS and stabbed two Naruto clones at the same time, and he dodged again with Nakara path as well - this path has zero impressive speed feats - , when Human path got shredded in the process:
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So, given the speed feats, Sasuke easily dodges FRS and if Naruto doesn't use clones, he can do six regular sized FRS:
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Heck, he requires two clones to make one FRS - two FRS per SM time, IF he doesn't leave clones on the Tree Mountain for more SM time, which is cut down to 5 minutes only:
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Once his time limit is out, he needs a lot of distraction to summon the other clone, which means that Frogs are needed here, and if he's fighting without the frogs, he's slaughtered the second his SM runs out:
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It takes several seconds to complete this, and if anyone here thinks that he survives against Sasuke during this time, then he needs to log off and never come back. So in the scenario where the Frog summons are not allowed, he's beaten low difference, as Sasuke can simply use Genjutsu on him and finish the job.
With the Frogs, Manda summon can easily handle two large frogs, and the last one can be put under Genjutsu and pitied against Naruto. This is easily a manga fact, given how Madara was fighting against Jiraiya, Bunta, and Katsuya and nearly killed Bunta and Jiraiya had Tsunade not intervened - it would have swallowed them whole:
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It's fast and extremely durable, as it survived such a massive Katon from Bunta's Oil and J's Katon combo:
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Manda easily clammed Bunta's sword between its jaws and swung it - don't think that it's just one summon. It's easily equal to more than two large frog summons:
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Ma and Pa cannot accomplish much here, as for the frog song they will have to use a large amount of Sage Chakra and it takes too long, long enough that J had to hide it out in the pipes and Deva managed to kill Pa before he could even use it. So, forget that one. Add Aoda with Manda and Sasuke takes it rather easily, as the balance would be drastically shifted in the favour of Snake summons given what I have shown.
Sasuke has flight and speed to dodge FRS easily. He has Genjutsu to temporary paralyze Naruto even in the presence of Sage Frogs. Before they can snap him out of it, he can easily blitz and kill him off. Rasangan will only work in Close Ranged combat and in this regard, Sasuke can even use Sage enhanced Nagashi to paralyze SM Naruto.
Too many things go in Sasuke's favour. He wins easily without summons and mid difference in the summoning scenario.
