Has a FIBA World Cup game ever ended 100-98?
Exactly once. On September 9, 2019, Australia beat France 100-98, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 100-98 in league history.
That makes 100-98 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 101-98 has happened never and 100-99 has happened never.