In what ways did Nazism resemble Mussolini’s fascism? How did Nazism differ from fascism?

Also, Naziism is an extreme and warped form/interpretation/expression of Fascism. Hitler's initially admired Mussolini (as did Churhill and others), his Nazi movement infact copied Mussolini's Fascism Doctrine and then subsequently warped it to his needs by including racism and beliefs of Aryan superiority.