From their brief bout before Sasuke drained the Tailed Beast Chakra, both Naruto and Sasuke were portrayed as...evenly matched tbh.
There's implication that Naruto could have killed Sasuke if he really had to, although portrayal of that fight suggested otherwise.
This would exclude the boost applied towards Naruto when a Kurama Shadow Clone gathered natural energy and passed that energy towards Naruto (which was the catalyst for him achieving that Asura avatar state).