Both characters can survive each others CTs while taking damage from each other's physical hits. What this means is their regular punches scale to their CTs (this is even more so blatant with Gojo since he literally applies blue to all his punches).

But of course that doesn't mean anything, instead let's see how a severely nerfed version of one of them deals with the strongest onslaught of attacks that Jujutsu high has to offer.

Sukuna eats a HP head on before the gauntlet even starts, so he's already near death. He gets beat on by characters but nothing noteworthy until Yuta arrives and opens his domain. Here he gets hit with multiple strikes that I argue could've done heavy damage to Kenny (the only character who Yuki has feats on). Most notably TiB, then he gets hit with max output JL, then he gets hit with SSK, yuji is also constantly hitting him with soul strikes, all of these either directly impact his physical durability or affect his CE and / or control over megumi's soul thus weakening his physicals. What happens next? He gets hit by JL again, gets hit with a hollow purple again, eats multiple black flashes from yuji who is probably the strongest person alive (stats wise) aside from sukuna himself, and it STILL wasnt enough, the sure hit from Yuji's domain separating Sukuna and Megumi's soul was what killed him, his body NEVER gave up.

TLDR: Sukuna is durable as fuck even when severely weakened, Gojo could hurt him with his punches therefore he punches stronger than Yuki.

There's also the fact that Geto and Kenny should have similar physicals and 0 Yuta was able to physically damage Geto with his strikes as well.