It takes time for Mbappe to become an important player at Real Madrid and I am also sure that he will slowly adapt well with his teammates.
I also believe that Mbappe will be able to adapt to Real Madrid and will become one of the best strikers in the world. Right now I see that Vini and Mbappe still don't have a good bond. That's normal because both players are important players for Real Madrid right now. Both still have their own egos. It will take time but I don't think it will be long. Vini had a difficult time when he first played at Real Madrid and Mbappe will feel the same way.
it's normal to have this position conflict when an original position or better put a natural position player is coming to replace a false position player due to adjustments, before now, vinicius has been a false strike for Madrid almost a whole season so it could be possible he'd already adjusted to the position so well already that bringing in an original striker which happens to be mbappe will result in the slight position conflict but with time they will get used to playing in their respective positions a d bond better, mbbape obviously have a good future ahead in Madrid and is definitely going to come out a very fine striker on every level and standard. Madrid is just that perfect platform for the optimal career projection mbappe needed.