Has a FIBA World Cup game ever ended 78-68?
Exactly once. On August 5, 2017, Bulgaria beat Belarus 78-68, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 78-68 in league history.
That makes 78-68 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 79-68 has happened 2 times and 78-69 has happened 2 times.