I'm not talking only about the power they were given, but about the way they are being portrated in general. Besides, their previous powers they had, BM naruto was equal to PS sasuke, and BSM was somewhat above. Not by much tough. And tough sasuke has hashi's cells, we don't know in what portion he got it. Besides, naruto now has acess to the powers of all other 8 bijuu.Even if the power power Hagoromo gave to Naruto and Sasuke were of an equal portion it doesn't deny the fact that they have their own personal power unto which it was added. Before Hagoromo gave Sasuke Indra's inheritance he already had Senju DNA [Yoton] being fueled into his body; something Indra did not possess.
Regarding Senjutsu you're forgetting that Sasuke now has Hashirama's DNA which can be used to gather Natural energy; also to be used as the medium to perfectly balance Natural energy with his Physical and Spiritual energies----essentially replicating Madara. We've already seen that he can channel thise energy through his Mangekyo techniques and it is in this regard that he surpasses Madara.
Hmmm...
My thought's are that it's an overlapping of Doujutsu. Sasuke may be able to jointly use Rin'negan and Sharingan abilities and/or entirely display each Doujutu's abilities through abilities of the other. Allowing Susano'o to use Shinra-Tenesi would be an example.
"What happens when he decides amplifies his Doujutsu with it?" <- is the obstacle that prevents me from seeing how Naruto could possibly be potentially stronger.
No, I'm not forgeting it. In fact, I said it myself that perhaps that would even help sasuke, but it wouldn't allow him to acess SM. As we've seen with madara, he didn't fully enter SM. The natural energy was balanced with the hashirama cells he had, not within his whole body, as we've seen with naruto. That's why he said "only this much power? this will be easy to handle".
Sasuke could do the same, as I also said previously. But that alone wouldn't put him above naruto.
However, all this isn't enough for him to master SM. He still can't balance it with his chakra(all his chakra), and he still needs to learn that in order to fully enter SM.