Has a FIBA World Cup game ever ended 75-55?
Exactly once. On November 26, 2017, Lithuania beat Poland 75-55, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 75-55 in league history.
That makes 75-55 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 76-55 has happened 1 times and 75-56 has happened never.