IMO, Naruto in Sage mode will obv win against Sasuke's level 2 Cursed Mark form, Because Sasuke in CSL2M, He's fights and mid range and sometimes long rage unless However Naruto in SM can easily defeat him because;
1) Naruto's physical strength, speed, stamina, and durability dramatically increase, to the point where they could fall face first into a bed of spikes and receive no injury whatsoever.
2) Naruto's Ninjutsu would become more powerful.
3) He can harness the natural energy surrounding them, turning it into an extension of their body, and increasing the reach of their attacks.
4) He also gains the ability to sense chakra around them.
So reading that already tells you Naruto in SM against Sasuke CSL2 = Pwned.
Now about Naruto in controlled 9 tails form against Sasuke Sasunoo, Tbh all I can say is Naruto will be faster..and Stronger obv but as we know Sasuke's gonna get the EMS, so yeah.