Yes Each ryuha will have its own methodology and approach, I don’t just mean the ryuha of the Bujinkan now. It might be something small like the difference between thumb position of the left hand when the sword is in the saya. For example my understanding is that Tenshin shoden katori shinto ryu does this differently to Muso Jikiden Eishin Ryu. On the other hand it may be something more drastic. Also you have to look at when the ryu was active i.e. was it developed for fighting against an armored opponent or one in more day to day wear? This is from my limited understanding. The Bujinkan draws on a number of schools for its Kenjutsu and then of course you have the kenjutsu specific to certain ryu in the Bujinkan.