After trial, Judge Juan Laya of the Manila RTC found Benjamin Garcia guilty of Murder, the victim having sustained several bullet wounds in his body so that he died despite medical assistance given in the Ospital ng Manila. Because the weapon used by Benjamin was unlicensed and the qualifying circumstance of treachery was found to be present, Judge Laya rendered his decision convicting Benjamin and sentencing him to "reclusion perpetua or life imprisonment." Are "reclusion perpetua" and life imprisonment the same and can be imposed interchangeably as in the foregoing sentence? Or are they totally different? State your reasons. (2005, 2001, 1994 BAR)