apollo 11

Is it possible that Apollo 11 could've had a different crew? If so, who are the most likely to replace Neil Armstrong and Buzz Aldrin as the first men on the moon?

When Walter Cronkite delivered the news of Apollo 12's successful moon landing, Humanity cried tears of Joy. But when Pete Conrad and Alan Bean Saluted when they arrived at the moon, in memory of Neil Armstrong and Buzz Aldrin, those who perished in Apollo 11 tragedy, We cried tears of sorrow...