I think it's possible to be doing approximately the same thing, but still have a changed resolve, because the inner you as changed so significantly that you're doing it for different reasons. Consider the differences between the Buzz at the start of Toy Story and the one at the end: the first really, truly believes he's a space ranger, and the reason he acts the way he does boils down to being a good space ranger; whereas at the end, after his moment of realization when watching the commercials and attempting to fly, he acts the way he does to be a good toy. Like he says, he understand now that while he can't fly, he can still "fall with style."
Whereas with Miguel, his central desire is to be independent. He doesn't rebel from his family because he doesn't like them; he rebels because they won't let him be independent. Once his family lets go, he can be independent all he wants, and his family will support him.
I wrote a story once about this woman whose mentor died, but she couldn't find the tears to cry about it, because she was a very logical, rational person. At the end of the story, she still doesn't cry, but her framing around her grief completely changes, and she's able to accept the heartache she'd been repressing. The key thing about a change in resolve isn't that the character's actions change, but the desires that drive them.