According to "infallible" Wikipedia, Charles the Bold offered to Nicholas I, Duke of Lorraine, the hand of his daughter Mary. He accepted, but died in battle in 1473. WI he had not died and had married the heiress of Burgundy? IOTL he had no legitimate children, and Lorraine was inherited by his cousin René. However, he had an illegitimate daughter, so it's probable that he and Mary would have children. Which kind of differences we could see in Europe with a united Lorraine-Burgundy?