Has a FIBA World Cup game ever ended 91-56?
Exactly once. On July 4, 2022, Iran beat Syria 91-56, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 91-56 in league history.
That makes 91-56 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 92-56 has happened 2 times and 91-57 has happened 2 times.