I actually think that RJJ was slightly more developed in the begining, I mean theres fights where you see RJJs speed, footwork was more advanced and developed the PBFs.
I also think PBF was still in the learning process of his style where in some fights you could see he was still learning that shoulder roll and was trying out new things as he went long while RJJ fought more freely/freestyle and went with the flow. Where as like I said PBF was figureing out what worked for him and what didn't.