True, just the outfield is different.False. I played college baseball and our field dimensions were the same as MLB dimensions. Fields have different outfield wall dimensions but the base paths and pitching distance is the same from high school up to MLB.
But basketball ball would have been a better example of uniformity.
Throughout gyms, parks, and driveways around the world, basketball hoops are almost always 10 feet (3 meters) off the ground. Some leagues for young children play on shorter hoops, but from junior high schools through the professional leagues, the game is played on hoops of the standard 10-foot height.
Even though players today are much taller, they haven't raised the rims to 12' like it was in the past.