Has a FIBA World Cup game ever ended 79-76?
Exactly once. On September 2, 2019, Poland beat China 79-76, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 79-76 in league history.
That makes 79-76 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 80-76 has happened 4 times and 79-77 has happened 4 times.