I'm not a big fan of Naruto (I stopped watching it in shippuden chap40) but in a newspaper (2019) I read an interview of the creator where he said something like that: "Even with one arm, Sasuke can equate Naruto in fight".

Idk know if it is correct with what is happening in more resent episodes since sometimes interviews contradict with what is shown (for example Kuramada said Virgo was the strongest saint but in recent episodes everyone is saying that Gemini is the best).