Edit: as one guy pointed out in the comments, Gojo and sukuna were at a lower level of output during the entire time Gojo fought mahoraga so I am pretty much just wrong about most of what I say here.
Ok, so in case you didn't know a Gege recently released some more stuff for Modulo (revealing that Todo is married to Takada) and apparently this included a statement about mahoraga. now I do think we should take the statement with a grain of salt because it might be a case where the initial translation to english was not precise, which has happened before.
now the statement allegedly says: Shibuya Mahoraga, Modulo Mahoraga and Sukuna's Mahoraga were all equal in strength. Shibuya and Modulo Mahoraga being equal makes sense, it confirms that taming ritual mahoraga is always the same strength and the ten shadows sorcerer cannot do something to influence this to strengthen or weaken it like a binding vow. otherwise you probably would have seen a case of "to amend this the Zenin clan head made another binding vow" to weaken mahoraga enough to tame it.
however, stating that Sukunas Mahoraga is equal to taming ritual mahoraga has massive implications. for one it might debunk a long held belief that Ten Shadows shikigami grow stronger as their user grows stronger, via the user having higher output. When sukuna summoned other shikigami they were massively stronger, and seemed to confirm that belief. now you might be able to get around this by saying that Taming ritual mahoraga is already so strong that he is equivalent to a tamed mahoraga summoned by a sukuna or gojo level sorcerer. so every other Shikigami would get a boost and Mahoraga would stay relatively similar in sukunas hands, and would actually be weaker if anyone on a lower level managed to tame him.
Now the second and more important thing is the massive upscale this gives 15 finger yujikuna and yuji's body. if the Shibuya mahoraga has equal stats to the Tamed mahoraga in shinjuku then that means Sukuna in Yuji's body had better stats than gojo even at 15 fingers (with that boost being entirely due to yujis body). During the shibuya fight in the manga continuity, Sukuna is visibly faster than mahoraga, and his punches and kicks are effective against mahoraga despite not enchancing them with blue like gojo did.
in the Shinjuku fight gojos performance against mahoraga was similar, Mahoraga did land some hits on him and did do damage but that was with Sukuna actively helping him 2 and even 3v1 gojo. Now gojo was enhancing his speed and punching power with blue so this somewhat counteracts Mahoraga needing help to fight him in hand to hand. and we do see in shinjuku that Gojos blue infused punches are more effective than yujikunas in shibuya, (there is one panel where mahoraga is barfing) however it is not by that much.
So, sukuna at 15 fingers was putting up a similar, if not better performance against Mahoraga in hand to hand than a full strength gojo who could use his technique to enhance his hand to hand with the caveat that Mahoraga was fighting gojo in a 2v1 and later a 3v1.
gojo and 20f sukuna are clearly relative in stats without gojos ct, we see this during their hand to hand whenever gojos CT is burnt out, so a 15finger sukuna should not be able to scale to him. so with all of this laid out the only conclusion we can make is that Yuji's body was such a massive boost for sukunas physical stats that it made up for the five finger difference in CE. Mahoraga also had a dominant hand to hand performance against dabura, with Dabura only turning the tide after changing his mindset and starting to rapidly evolve as a sorcerer and develop his cursed technique.
this makes some sense, Kenjaku deliberately designed yuji to have better physical stats to aid sukuna because he believed that the strength of a sorcerers body was one of the most important factors in determining their strength. he made yuji to give sukuna a boost when he reincarnated, Kenjaku did not plan on sukuna choosing another vessel because he liked their technique.
if this is true then it changes powerscaling somewhat, shibuya sukuna having equal or better physical stats to 20 finger meguna is a massive upscale for anyone who fought him while he was in yujis body. for example Jogo, him getting no-diffed by sukuna is even less embarrasing if that sukuna was at his full physical stats. this would also kind of fit with some other statements, "Five Finger Sukuna vs Jogo would too long" and "a generous estimation would put you at 8 or 9 fingers". if Yuji's body gives sukuna a greater than 1/3rd boost in stats, then Kenjakus assesment of Jogo becomes a lot more accurate since we know that "8-9finger" jogo would have had a long drawn out battle against a five finger sukuna if he was in yujis body, giving him a stat boost large enough to make him equivalent to 7-8 finger sukuna without boosting his CT strength. Kenjaku was not just misleading jogo and it was infact a reliable statement.
it would also be massively impactful for yuji. once Yuji reaches Gojo and Sukunas output and skill with reinforcement, which it seems like he did in modulo given his impressive feats with his Cursed Techniques, then he will just have better stats by default. now, it was made explicitly clear throughout the manga that Yujis base strength was very helpful to him and allowed him to compete with people far above him in terms of CE amount and output like the todo and hanami fights. in the manga continuity yuji was actually beating the grade 2 cursed spirit at the start of the series before choosing to consume the finger because Megumi told him that the only way to kill it was with CE. So Yuji getting a larger stat boost than we thought from his body should also mean that he had lower reserves and output than we thought, making his growth as a sorcerer slower and more reasonable as a result. it should be much easier for someone at a low level to gain strength than someone at a higher level.
So in conclusion, Yuji is built different.