The identity of the other women in the parallel passages in Matthew 27:56 and Mark 15:40 is given as Mary Magdalene, "Mary the mother of James and Joses," and "Salome the mother of Zebedee's children" (Matthew), "Salome" (Mark).
As a result of these parallels commentators have identified "Mary of Clopas" with Mary mother of "James, son of Alphaeus."