To clarify, Razor's Devils and Goreinu's gorillas aren't created using conjuring but emission. An emitter simply separates and maintains their aura from their body while a conjurer uses their aura to create an "actual" object. To give a concrete example: when White Goreinu's head was crushed by the ball you saw that it was "made of nen". If it had been conjured there would have been blood, brains, etc. instead.