@FloriGlori Well more than articles it is better to say that they were posts which highlighted these odd similarities.
Anyway these are the points:
Plot: Chunin exam is the hunter exam. HE starts with a test (old woman), CE starts with a test (snake girl), HE(CE) has a phase where you have to steal the tags (scrolls) from other people to advance, HE(CE) ends with a tournament to decide who pass it (same but HxH tournament was more original).
Killua(Sasuke) is Gon(Naruto) best friend, after a certain point the MC has to save his shady friend from his evil mentor who tries to make him become evil and go under his wing. Difference is that HxH makes this last an arc while Naruto bases the entire serie on this.
Characters:
Kurapika and Killua (Sasuke). Kurapika is the only survivor of his clan (which specializes in special red eyes with ocular powers) and his motive in life is to take revenge on the killers, also these special red eyes make him go in god mode and are activated when he is enraged.
Killua has lighting powers and an attack which reminds something that Sasuke uses qutlite often, plus all the brother drama said above.
Gon and Naruto. There is not much here aside from the standard shounen mc sad backstory and how Naruto's rasengan reminds of Gon's rock.
Orochimaru and Hisoka. Creepy pedo bastard who wants one (or even both for H) of the MC, is a villain at first but later becomes an antivillain who helps the MCs, also part of the evil killer organization which he will later betray to follow his own agenda.
Nen and Chakra. Even the tests to see which category you have are almost the same.
Naruto, Sasuke and Sakura and Gon, Killua and Biscuit.
Only Sakura and Biscuit are left, Biscuit inspires Tsunade too of course. Old woman who uses her powers to look young, great physical strength which she usually uses even to scare the MC(s).
Netero and Hashirama. The buddha.
And most likely others I skipped. I know that somebody wills say that this is normal since every manga takes inspiration from others etc but if you look at the whole picture-list the story changes.
Edit: here is a post which expands a bit or at least explains, probably better, what I have already posted:
https://www.pinoyexchange.com/discussion/533345/naruto-a-failed-copy-of-hunter-x-hunter