KCM Naruto has the tools to defeat MS Itachi (outlasting him), but the question is whether he'd play his cards right.
In character and without much intel, Naruto is going to keep on coming at Itachi recklessly without any solid strategies. Sure, KCM Naruto can shunshin to avoid whatever Itachi throws at him, but I don't recall him ever attacking while incorporating that shunshin speed that allowed him to avoid Ay's V2 punch. Itachi can take him on just fine in CQC per canon, and Tsukiyomi one shots. Kage Bunshins and FRS are handled with Susano'o.