i don't know much about this, but wikipedia lists the culural revolution as one of the "basic components" of maoism. so your distinction between the two doesn't seem to make much sense. can you clarify?
"The Cultural Revolution" was a horrible play Mao instigated through the Gang of Four in order to maintain power and throw those that might take it from him into disarray.
Cultural Revolution was used as an excuse to justify "The cultural revolution", but they are not the same, and you don't need students to go around killing people in order to achieve a cultural revolution.