Has a FIBA World Cup game ever ended 91-84?
It has. 91-84 has been a FIBA World Cup final 3 times in 2,041 games. The first was Puerto Rico beat Brazil on September 7, 2002; the latest was Italy beat Georgia on August 27, 2022.
That makes 91-84 the 96th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 92-84 has happened 3 times and 91-85 has happened never.