Delco GPS Unit

Does anyone know if I can plug in the delco gm gps unit that comes with the buick rendevous. I spoke to GM and I was told that the Century and the rendevous use the same radio and wiring harness. Also can a rendevous that came with a radio be swapped with the delco gps that is an option on this
vehicle? If it can be then the gps should also work in the century.