Yes, a half back is basically the same thing as a running back.
A Half Back is an old way to describe a player in the backfield in
football. There are three distinct positions that first arose in
footbal for players behind the line of scrimmage.
The quarterback, the half back and the full back. The quarterback
was the closest to the line of scrimmage, the full back was the
furthest fom the LOS and the half back was in the middle, you
guessed half way between the two.