Has an International Rugby game ever ended 60-26?
Exactly once. On February 21, 1998, England beat Wales 60-26, and no International Rugby game before or since has ended that way. When it happened it was a scorigami, the first 60-26 in league history.
That makes 60-26 the 510th most common final score out of 844 that have ever occurred in International Rugby. One point away, 61-26 has happened never and 60-27 has happened never.