We do have an exact % to the purple that Sukuna took though?
It was
initially at 200%:
Sukuna notes that it was at
over 120% when it reaches him:
It's said that Sukuna only sensed purple at the very last moment before it hit him:
So the purple that Sukuna took was at
~120%, which is beyond a regular purple (which would make it in-verse
not only similar but superior to the kick's potency)
Sukuna even implies that if they both weren't weakened, he'd be able to survive a 100% purple at a short distance in the same way to make this consistent (he couldn't at this point since he was more weakened than Gojo):