Board Thread:Naruto Discussions/@comment-38792431-20200226192508/@comment-38792431-20200301082658

Squinty97 wrote: A jutsu's rank doesn't denote its power or its offensive capabilities. It denotes its difficulty.

The difference between them is simply Kakashi has developed it further. Same principles. They have separate pages in the databook and separate ranks as well as you mentioned.

Not only that, Sasuke makes a point to correct Deidara during their fight; Deidara calls Sasuke's jutsu "Raikiri," but Sasuke corrects him saying it's only "Chidori. I wrote it in the comment, On the official translation sasuke says that the actual name for the jutsu is chidori, (because raikiri is just a nickname), sasuke can use lightning release way better than kakashi can now, arguably he can add lightning release to the rasengan which kakashi failed to do, but it will be still chidori(or rasegnan type), becasue kakashi is the reason why chidori got it's nickname raikiri, if sasuke cut the lightning in half like kakashi did it once(which sasuke can do now casually) and people make nickname out of the jutsu maybe than, sasukes chidori would get a nickname of raikiri too, for example harem jutsu or oiroke is not an actual jutsu it's same as transformation E-rank jutsu, shadows clones are just b rank, but becasue naruto's jutsu is used differently to "seduce" people it's got it's rank, same way just because kakashi used chidoori to cut the lighning it's got it's rank. the most acurate explanation was from gai when he explained that kakashi's chidori got it';s nick name when he cut the lighning in half. just becasue the name is different or rank (Harem Technique being A-rank, Reverse Harem Technique being D rank when they're totally the same jutsu) does not mean those are different jutsu.