It is the same as far as how we use it and how we identify it. It is a grounded circuit conductor. It is not a neutral. All too often the term grounded conductor and neutral are used interchangeably and that is not correct.
Both the corner grounded system and the 120/240 volt single phase systems have two ungrounded circuit conductors and one grounded circuit conductor. There is, of course, a difference in the voltage readings between the grounded and ungrounded conductors of the two systems, and one system is single phase and the other is three phase.
