Does the KRNS conflict with the Bujinkan and other Iga based systems?
No. The KRNS deals extensively with Koga Ryu Ninjutsu, not with Iga based Ninjutsu. The only time the two may come in contact with each other is during historic research or experimentation/ comparison. The KRNS does not issue rank in anything other than Koga Ryu Ninjutsu, similarly with Iga based systems not issuing rank in Koga based Ninjutsu.