Personality wise, what's the difference between New Galio and Zac?

This is not a discussion about the kits or lore(not directly). This is a discussion about what makes Galio different than Zac in terms of their personality. Right now, it seems like both of them are superhero wannabes that like fighting and protecting people. They also both seem rather cocky and arrogant. And the "Why don't you pick on someone my size?" voiceline from the Galio rework trailer would fit Zac's personality just as well as it fits New Galio

I know there's enough lorewise and kitwise that differentiates the two, as well as design. But the personalities feel really similar to each other, at least from just judging the trailer. I'm hoping that maybe we'll see more differences in personality when we get all the voicelines, or maybe even a Rioter could chime in and explain things

But anyways, discuss