They say that a person is both a product of Nature and Nurture. One cannot be the person they become without both elements. There have been stories of identical twins separated at birth who like the same things down to food, clothing preferences and choice of hobbies. That is Nature at work. The fact that said twins could have diametrically opposite views on life from their views on religion to personal morals is the work of Nurture.
As Kabuto stood and stared, he tried not to think about what the fact that the sanest of his mentor's clones was currently swinging from the ceiling fan in his underwear and singing a rather...colorful song about frogs said about Master Orochimaru.