Zuko was an emotionally abused boy trying very hard to win the love of his father through obsessing over capturing the avatar for him. At first, he is played as a villain for most of the show and shown to be driven to capture the avatar not really for honor (despite what he said) but really, for love and acceptance. He is shown later to begin to realize his actions were misguided, and tries hard for redemption but repeatedly shown falling back into his old habits and thoughts. He realizes his faults, he grows and redeems himself in the eyes of the group. Zuko does bad things, gets punished for them all the time throughout the show even to the point it never seems like he'd be able to break the string of karma following him.
He hurts people, he hurts himself, and eventually he works hard to get the reward he wanted all along. Love and acceptance. And the option was always right there in front of his face.
Mako is never once shown to take responsibility for his actions and sneaks past any. Doing things for selfish emotional actions. Mako is shown as a good guy who is being a dumb teenager, and like most dumb teenagers do not learn a thing other then wanting dat pretty a**. Cruel to both females and even to his brother at times, he gets Korra by purely going "I want you not Asami. Kiss plz kthx" without admitting to hurting both Bolin and Asami. Even if the break up was small and adult, he did not own up to his actions very well.
He insults people, goes behind their backs, hurts his own brother he's apparently supposed to be protecting and the most he says is similar to "Girls are crazy" as his apology. He does not own up or go through any sort of problem come the end. Gets Korra in the end because of dumb writing and is never -truly- punished for his actions.
So no. No they are not.