Has an International Rugby game ever ended 24-14?
Yes. International Rugby has seen a final score of 24-14 6 times. It first happened on February 7, 1925, when Scotland beat Wales, and most recently on February 8, 2020, when Ireland beat Wales.
That makes 24-14 the 90th most common final score out of 844 that have ever occurred in International Rugby. One point away, 25-14 has happened 3 times and 24-15 has happened 7 times. At one point the score disappeared for 47 years, between 1925 and 1972.