No, they are not the same place. +90 would be the North pole, and -90 would be the South pole. For them to be the same place it would need to be on the equator, so 0, 180 = 0, -180

No, they are not the same place. +90 would be the North pole, and -90 would be the South pole. For them to be the same place it would need to be on the equator, so 0, 180 = 0, -180

This image might help make it clear

From Geographic Coordinate System - Wikipedia