Board Thread:Theories and Speculation/@comment-30355627-20170210181343/@comment-30168027-20170214194701

they both have hag's chakra, because sasuke was able to feel naruto's chakra dimension's away without being even a sensor type, also zetsu stated that those who have six paths yin and yang powers are related to them (they may have lose the marks on their hands which means that lose abbility to use six paths chibaku tensei, but they have the abilities to use the marks powers even that we don't know which they are besides naruto that he can restore lost limbs) this explain why they are able to feel eachother's chakra

stated on the wiki:

As noted by Black Zetsu, there is a special resonance between the Six Paths Yin and Yang powers, allowing the wielders to sense each other's presence.[2] When the Yin and Yang powers are used together, they can seal and transform their target into the core of the Six Paths — Chibaku Tensei technique. When Naruto did so in conjunction with Sasuke Uchiha's Six Paths Yin Power, the mark on his right hand vanished, returning to Hagoromo's own right hand.