I am sure of it, I watched Messi play a lot as a teenager. His dribbling was better than Lamine's, but Lamine's passing is better at this age. I watched Messi's whole career, he was not passing the ball as a teen like he did later.
Passing involves one/twos, throught balls, first touch, etc...Messi was born with those and played as an enganche in Rosario, it's Barca the one that let him be a bit of an enganche in La Masia but mostly "turned" him in an inverted winger, specially to later to find him a place in the Senior team. The mature "enganche" from Messi, was just returning to his roots and focusing even more because time makes any player loose his legs.
He always had very mature actions even being a kid, yet the thing with Messi, it's not that his dribbling
was just better, his dribbling already looked Maradona/Pele/ ubber Zico alike since a very tender age. This obviously would make a teenager used it most of times since it was very hard to take the ball from him. It's not that he
learned his passing while growing, he just adapted to what the teams needed from him and to his own physical changes regarding pace and stamina.
What Yamal it's
better than Messi at the same age, it's in being less individualistic, play with more pause, while he was asigned a diff role, than the more confine one Messi had in his younger years. Yet Messi obviously would be
worse regarding those aspects, because his natural pace, ability and ubber electric game triggered him by mere instict to take it against a whole team, you can see the same with Maradona when a kid in Argentinos Jrs, (or even in Boca and Barcelona). Everything was already there, but the dude could take on entire teams so he did it.
Yamal cannot do that at THAT level (not that he can't, but not with such dominance and level of pace) and it's intelligent enough to not try that, he chooses his moments, he plays less one twos at high pace in tighter spaces also because it's a diff Barca that needs him playing more long balls than Messi at similar ages and that tries to uses him as much as they can in open space; sthg BTW that Barca in Messi's era, tried a lot less than they should, I would have love to see Messi playing under Klopp, Mou, Flick, less "La Masia " alike coaches.
Also passing the way Messi does since born at such pace, it's not for everyone, even as special as Yamal is and hopefuly would become. Messi is the type of player that the worst pass sent to him, he'll control it at highest pace, makes it good and in the same flow of play releases another, even a through ball, without even turn down a notch in his pace nor loosing the ability of reading his surroundings. Very few players could do this in the game at such level, and that it's the hardest passing there is to be made.