Different clubs I think.
FP seems to refer to face progression...
Face progression is defined as the position of the leading edge of the clubface in relation to the centerline of the hosel. The higher the number (3.5mm ~ 4.5mm) the more face progression the club has. 0 face progression would mean the leading edge of the clubface is in the same vertical plane as the hosel's centerline (which we would normally refer to as an offset position).