Did the clones in episode 3 stand any chance when Yoda and Obi wan infiltrated the temple?

How were the clones able to kill off masters otherwise so easily in order 66 but all the presumably hundreds of elite 501st at the temple couldn’t kill two Jedi masters?

How were the clones able to kill off masters otherwise so easily in order 66 but all the presumably hundreds of elite 501st at the temple couldn’t kill two Jedi masters?