A 14-year-old Cambridge boy arrested last week for groping two women has been charged with two similar crimes, Cambridge police said today. On Jan. 5, two women called police around 7 p.m. to report that they had been groped by a man near Inman Square. Police were dispatched and arrested the juvenile, whose name has not been released, after the victims identified him. He was charged with two counts of indecent assault and battery, according to police. Two days earlier, police had received calls from two other women at about 7 p.m. reporting that they had been assaulted. Police believe all four cases are related.