Bonjour à tous ! I did a bit of the research and I would say le Dauphin and Charles d’Orléans are two different people. Le Dauphin, the son of Charles VI and Isabeau of Bavaria, became indeed Charles VII but Charles d’Orléans is the son of the assassinated Louis I d’Orléans, Duke of Orléans.
Jeanne d'Arc is one of the most famous women throughout French history. Listen and then read our bilingual article, the third in our series of Portraits français.
Note: The tenses in this French article and its English translation don't match! In French, we use the present tense to describe historical stories like this to evoke a sense of immediacy, whereas in English, we commonly use the past tense - learn more about historical French tenses.