Has an International Rugby game ever ended 33-32?
Exactly once. On June 20, 2003, Argentina beat France 33-32, and no International Rugby game before or since has ended that way. When it happened it was a scorigami, the first 33-32 in league history.
That makes 33-32 the 510th most common final score out of 844 that have ever occurred in International Rugby. One point away, 34-32 has happened never and 33-33 has happened never.