Perhaps the first son of Louis XI survives past childhood, so when marriage to Mary of Burgundy comes around, particularly if Charles the Bold does on schedule, the elder Louis' tone is more conciliatory to the Burgundians. ATL Louis the Younger and Mary leave one male heir, Charles, but both Mary and her son Charles outlive both Louis XI and Louis the Younger. Mary's son Charles becomes TTL's Charles VIII while Mary continues to rule Burgundy in her own name until she passes, leaving her entire Burgundian inheritance to a young, wealthy, ambitious, and forward-thinking alternate Charles VIII, who has little interest in Italian affairs and instead focuses all his energies on harnessing the wealth his combined lands.
Castile and Aragon can still unite into Spain and possibly still have Colombus in their own employ who still lands in the Caribbean nearly on schedule. With news of land to the west, TTL Charles VIII decides to send a much larger fleet out west. The Valois/Trastámara rivalry will come to define European politics for the next century as France and Spain jockey for advantage in the New World.
Castile and Aragon can still unite into Spain and possibly still have Colombus in their own employ who still lands in the Caribbean nearly on schedule. With news of land to the west, TTL Charles VIII decides to send a much larger fleet out west. The Valois/Trastámara rivalry will come to define European politics for the next century as France and Spain jockey for advantage in the New World.