Has an International Rugby game ever ended 25-16?
It has. 25-16 has been a International Rugby final 4 times in 2,783 games. The first was Argentina beat Italy on May 28, 1987; the latest was Australia beat Wales on July 6, 2024.
That makes 25-16 the 183rd most common final score out of 844 that have ever occurred in International Rugby. One point away, 26-16 has happened 6 times and 25-17 has happened 6 times.