I think comparing age 1:1 is a bit silly.
The young Iniesta was more of a dribbler in his first years for Barcelona A, he was a great player often coming in as a sub, changing games. He couldn't shoot, but had great close control, was very agile, and made good decisions. Pedri looked more like Iniesta in his first months, now he is more like a Xavi with much worse decisions (he doesn't have the same vision, yet)
Pedri obviously gets to play at a higher level earlier than most other players. Vision and style can easily be developed with age, my question is if he will develop or not - I think he gained some bad habits during last season when he was auto-picked every game. It will be interesting to follow, and I like very much how he plays for Spain - although I still think he gets a bit overhyped because of his age.