Has a FIBA World Cup game ever ended 80-75?
Exactly once. On February 23, 2018, Lithuania beat Hungary 80-75, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 80-75 in league history.
That makes 80-75 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 81-75 has happened 4 times and 80-76 has happened 6 times.