No, they are not the same person.
charlamagne/chareles the great
Holy Roman Emperor.
charlemagne
Pope Leo III crowned Charlemagne as Emperor of the Romans, on December 25, 800.
Charlemagne was crowned as Holy Roman Emperor by Pope Leo III on December 25, 800.
Otto IV
Pope Leo III crowned Charlemagne as Emperor of the Romans on December 25, 800 AD.
Emperor Henry VI was excommunicated by Pope Celestine III.
Pope Leo III crowned Charlemagne emperor of the Romans (not the Roman people).
Pope Leo III crowned Charlemange in 800.
Charlemagne was crowned Emperor of the Romans by Pope Leo III in 800. He would be the first person in the west to bear this title since the deposition of the last Roman Emperor Romulus Augustus in 476.
Famously, Charlemagne was crowned Emperor of the Roman People on December 25, 800 by Pope Leo III. After that the subsequent emperors of the Carolingian and Holy Roman Empires were generally, but not all, crowned by the pope. When a person was elected emperor, he was not called the emperor, but King of Germany until the pope crowned him, but sometimes this took years to happen.