Yes, there's a similarity in those scenes, but a big difference, too. In II, after Michael tells Gardiner Shaw that he should take a business course as a backup, Shaw replies, diffidently, that he's heir to a big family fortune. Michael immediately replies that he shouldn't be ashamed of his wealth. In III, Michael wants Tony to finish law school, but, though he doesn't say so explicitly, I believe his ultimate purpose was to enlist Tony in the family enterprise. Tony says it: "I will always be your son, but I will never work for you."