For Matt Damon, it’s been nearly eight years since his surprise appearance in a 2018 “Saturday Night Live” opening sketch where he gave a memorable (and petulant) impersonation of Justice Brett M. Kavanaugh, who was then in the midst of his confirmation hearings for the Supreme Court. For Aziz Ansari, it’s been only one week since he popped up at the start of an “S.N.L.” broadcast to play the F.B.I. director, Kash Patel. This week, both actors were back, reprising their roles in the cold open