I'm going to assume Mack the truck from Cars
1. Both have a friend they care about deeply (Lightning, Peter Pan)
2. Both are tricked into doing something that hurts that friend (when the gang cars make Mack fall asleep and the back opens to lose Lightning, Hook manipulating Tink into telling him where Peter Pan lives)
3. Both can act as guides (Mack takes Lightning to all his races, Tink uses her pixie dust to let the ship fly and take the Darlings home)
Sally (Cars) and Pocahontas