It could have a huge impact. If Yoda imparts some deep Jedi knowledge, Grogu might become more confident in his Force abilities. He could be more decisive about his future as a Jedi or not. For example, if Yoda tells him about the importance of certain Jedi training, Grogu may strive to achieve those levels of training.
Grogu was a youngling in the Jedi Temple. He was there during the Clone Wars. His species is rare and not much is known about it. He managed to survive the purge of the Jedi and was hidden away until he was found by Din Djarin.
If Grogu travels back in time, he might become more confident in his abilities. Meeting powerful Jedi in the past could give him role models and a better understanding of his own potential. For example, if he meets Yoda as a youngling, he could learn how to better control his Force powers and be more assertive.
Well, Grogu's story is full of interesting elements. He is a survivor. After the fall of the Jedi, he managed to stay alive. His presence in the show brought a new level of charm. Din Djarin was initially just supposed to complete a job regarding Grogu but ended up caring for him deeply. Grogu's Force powers are not fully developed yet, but we can see glimpses of his great potential. He can sense danger and has used the Force to protect himself and his friends on multiple occasions. His little coos and gestures make him one of the most beloved characters in the Star Wars franchise.
The moment when Grogu was being trained by Luke Skywalker was really remarkable. We saw him start to really tap into his Force abilities more. He was learning new things and it was exciting to see his growth. Also, his interactions with the other Jedi trainees were quite interesting. He was a bit different from them, being much younger and having his own unique connection to the Force.
Grogu is a member of Yoda's species. He was raised at the Jedi Temple on Coruscant. But during the fall of the Republic, he was hidden away. His origin story is also tied to the events that led to the near - extinction of his species.
One key element is his time at the Jedi Temple. Another is the fall of the Republic which disrupted his life. Also, his species' rarity is an important part of his origin.