Has a FIBA World Cup game ever ended 80-73?
Exactly once. On November 30, 2018, Georgia beat Estonia 80-73, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 80-73 in league history.
That makes 80-73 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 81-73 has happened 5 times and 80-74 has happened 2 times.