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bro you're mixing things up
They were clones from the very beginning, cloned from Jango Fett the actual uber soldier. On the battle in the arena in 2nd part he killed two Jedi, a giant space rhinocesor, and was only stopped by master Samuel L. Jackson.
Soldiers in original trilogy were not clones, just regular dudes recruited from empire population. Clones had limited lifespan and the cloning operations were shut down some time after the events of the prequels so probably not a single one survived to the time of the 4th episode.