In this fanfiction scenario, Naruto being born 10 years earlier could have a huge impact on the story. For one, he'd be part of an earlier generation of ninja. He might have different relationships with the older characters. Maybe he'd train under different mentors, like perhaps he could have learned from the Third Hokage at a much younger age. This could lead to him developing different skills and a different combat style. Also, his presence in the ninja world so much earlier could change the political landscape as well, since his status as a Jinchuriki would be a factor much sooner.
If Naruto was born 5 years earlier, the entire timeline of the story would be disrupted. For one, he would be graduating from the Academy earlier and joining teams earlier. This could mean that he'd face stronger opponents at a younger age, which might either make him stronger faster or get him seriously injured. Also, his relationships with characters like Sasuke and Sakura would develop differently. Maybe Sasuke wouldn't see him as such a rival since Naruto would be ahead in terms of ninja development.
One consequence could be that Naruto would be more isolated in his early years. Since he'd be younger than most of his peers, they might not understand him as well. Also, the power dynamics in Konoha would shift. With Naruto developing his skills earlier, other ninja clans might feel threatened or more competitive. Another consequence is that Naruto's relationship with his father figure, Iruka, might not be as strong. Iruka might not have been his teacher in the same way if Naruto was born earlier.
In a 'naruto born earlier fanfiction', one possible scenario could be that he might grow up in a different political climate in the Hidden Leaf Village. Maybe he would have different relationships with the older generation. For example, he could form a closer bond with the Third Hokage at an earlier age and learn more about the village's secrets earlier on.
His relationships would be very different. He might not have the same bond with Sasuke and Sakura. Instead, he could form closer relationships with the older generation of ninja. For example, he might be friends with Kakashi when Kakashi was still a young and up - and - coming ninja. His relationship with the Hokage at that time would also be different. He could be seen as more of a protege to them rather than the young outcast he was in the original story.
He might be more mature earlier. Since he would have more time to experience life in the village, he could be less impulsive. For instance, he might not pull as many pranks as in the original story.
In a great deal of Naruto fanfiction, Naruto is indeed born in Uzumaki. This can add depth to his character as the Uzumaki clan has a rich history and unique abilities. Writers may use this to create stories where Naruto discovers his true Uzumaki potential earlier, perhaps having access to powerful sealing techniques from a young age, which could completely change the course of his life and the story as a whole.
In some fanfictions, if Naruto was born in Ame, he might have a very different upbringing. He could be exposed to the harsh environment and unique culture of Ame from the start. This might make him more cynical or street - smart compared to his original self in Konoha.
Yes, in fanfiction, anything can be possible. Writers can create alternate universes where Naruto is born in Kumo instead of Konoha. They can come up with various reasons for this change, like a mission that led his parents to Kumo before his birth or some sort of political arrangement.
Well, if Naruto was born a girl, it might change how she's perceived by the village and her interactions with other characters. It could also affect the way she develops her skills and powers.