FIBA has some different rules from NBA basketball in terms of what is officiated, in terms of the shapes on the court. The jarring difference was enough for Tim Duncan to infamously lament "FIBA sucks" after a particularly difficult run with Team USA. Some NBA players benefit from the closer (by 19 inches) three-point line and altogether lax officiating. Apparently, Duncan was not one of those players.
One day, the NBA and FIBA will adopt identical rules, and there will cease to be a difference between the bodies. Already, the NBA is considering the international game's legalization of offensive goaltending. Zones have been legalized in American pro basketball, leading to a new era of pick-and-roll and slash-and-kick attacks. Perhaps the imitation of FIBA at home helped Team USA toward a run of international competence. The era of increased defensive freedom in the NBA has coincided with the United States winning the last World Championship and the last gold medal.
There is still a difference between FIBA and the NBA beyond use of a four-letter vs. a three-letter acronym. The three-point line is the biggest one of all, seeing as 19 inches is quite a bit in a game of inches. Guys who shoot long twos are suddenly blessed with a game that makes sense (See: Dwyane Wade in 2006 and 2008). In general, outside shooters are rewarded at the expense of one-on-one isolation players. You hear that, aging Kobe Bryant? Less iso-play, more open threes please.