Has a FIBA World Cup game ever ended 75-63?
Exactly once. On August 3, 1998, Australia beat Brazil 75-63, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 75-63 in league history.
That makes 75-63 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 76-63 has happened 2 times and 75-64 has happened never.