For Sasuke, his chakra reserve would be much much higher at age 29-31 than it was at age17 so he can righter spam more jutsus or increase his jutsu's power by focusing more chakra into his jutsus such as his Chidori destroying half a meteor. Sasuke's skills in all fields increased much higher as well, Sasuke's base is about EMS Madara's Base which is higher than Kage level while War arc Sasuke would still be high Jounin. VoTE Sasuke wasn't close to mastering his Rinnegan while current Sasuke has it mastered to a much higher level so he can do things that VoTE Sasuke can't do or do as well. Current Sasuke is wiser and have more knowledge about a variety of things that can be used to aid him in combat.
In Naruto's case, his base in The Last was already mid-high Kage while War Naruto base was Jounin. Naruto in the Last shown improved Taijutsu (able to fight Toneri's puppets without clones while Hiashi who is a high Jounin and Byakugan master couldn't do with 2 body guards), chakra control and skills as shown when he easily made FRS with1 hand and controlled the way it flew. Naruto base reserves are also much higher than it was in the war thanks to the 2 years growth plus Hashirama's cells boosting his reserve and jutsus power. We see Naruto doing light training while waiting for his family to come how and going by Bolt and Hima age it takes place about 5 years after The Last movie events so we know Naruto have kept up with his training/kept his skills sharp (his battle senses dulled over time in Gaiden due to him not actually fighting but he wasn't dulled in Boruto like before). War arc Naruto was as strong as he was using Yin Kurama and added Rikudo Senjutsu (other 8 Bijuu chakras for Six path RSM) while current Naruto uses full Kurama (double the reserve and more powerful chakra than Yin or Yang Kurama) and Rikudo Senjutsu.
Both were obviously nerf so they can have a movie where Naruto and/or Sasuke don't finish it in the first couple of minutes.
In Naruto's case, his base in The Last was already mid-high Kage while War Naruto base was Jounin. Naruto in the Last shown improved Taijutsu (able to fight Toneri's puppets without clones while Hiashi who is a high Jounin and Byakugan master couldn't do with 2 body guards), chakra control and skills as shown when he easily made FRS with1 hand and controlled the way it flew. Naruto base reserves are also much higher than it was in the war thanks to the 2 years growth plus Hashirama's cells boosting his reserve and jutsus power. We see Naruto doing light training while waiting for his family to come how and going by Bolt and Hima age it takes place about 5 years after The Last movie events so we know Naruto have kept up with his training/kept his skills sharp (his battle senses dulled over time in Gaiden due to him not actually fighting but he wasn't dulled in Boruto like before). War arc Naruto was as strong as he was using Yin Kurama and added Rikudo Senjutsu (other 8 Bijuu chakras for Six path RSM) while current Naruto uses full Kurama (double the reserve and more powerful chakra than Yin or Yang Kurama) and Rikudo Senjutsu.
Both were obviously nerf so they can have a movie where Naruto and/or Sasuke don't finish it in the first couple of minutes.