[You're Naruto and he is 16]

After 3 years since Sasuke left the village, Naruto would be on a mission with Sakura, when they were on their way to the mission site, Naruto met a child similar to him, three stripes on his cheeks, and other things, but the rest was already similar to Sasuke and Menma notices and turns to look at him, does he come from another dimension where Sasuke and Naruto would have childrens or what?