Answer:
They both commited suicide due to realizing that they were losing the battle against Antony and Octavius at Phillipi. They are different because Cassius didn't neede to beg anyone to kill him his slave Pindarus had no trouble killing Cassius because it meant he was free from his rule and Cassius wouldn't be missed by most where as Brutus had to beg his soldiers to kill him because Brutus was an honorable man and prior to the speech of Antony at Caesar's funeral, was beloved by by the Romans.eventually the slave named Clitus allowed Brutus to run upon his sword.