I don't see how Sukuna wouldn't burn out his Domain Expansion like how it happened in the manga. In which case, he's easy pickings for Gojo #2 who will have his DE while Sukuna doesn't
1- "That Sukuna", even during the domain clashes had Gojo was wondering on panel why Sukuna wasn't using his CT when he had ample chances and missing chances to go for better strategies (and the answer was because he was using Mahoraga in secret). Sukuna was aiming for something different than simply beating Gojo since the beginning. It was a risky gamble on his part, even more so while holding back his heian form restoration and Open.
"Like how it happened in the manga" doesn't apply when he's not going for that in the given context of the thread. In this context, Sukuna isn't trying to learn a new move with Mahoraga, he just wants to kill Gojo and will use his own CT. His entire strategy will be different, and he knows there are two Gojos, we can agree Sukuna is a pretty clever guy.
2- In Point 1 I talked about "that Sukuna" and how this is a different scenario. However, this thread is even worse because it's asking about current Sukuna with world slash and his original body, which includes not only a different physique but two mouths and four arms (which isn't just a jujutsu advantage but a big cqc advantage). Even without theorizing about Open or whatever else Sukuna held back, and even without entertaining the possibility that he can just imprint world slash as the sure-hit effect of his DE and instantly kill both Gojos... Gojo, who admitted to not making a weaker version of Sukuna even give it his all in their fight, wouldn't push current full power Sukuna to burning out his DE.
Don't know about diffs, but Sukuna wins.
Edit: I could be meaner and point out how hard it was for Sukuna to end Gojo as soon as he learnt World Slash. And that was a "one foot on his grave, DE-less, RCT-less, almost CT-less, one-armed, brain damaged, badly burnt" Sukuna, not full power Heian Sukuna, vs "full-power, fully restored, 4 black flashes amped" Gojo.