I see it mainly in Fantasy Books.
One Brother is the good one, he is manly, strong, don’t care about riches, and have a good heart. He will be the protagonist or the protagonist friend.
The other one is the Bad Brother, he have a more weak body, have femine traits, always using fancy clothes and jewels, is less loved by others, and he is jealous. He will be the antagonist.
In a arc of >!Ranger!< this trope is reverse, which was a breath of air.
You might like reading 100 years of solitude where one brother is one type, and the other is another. Then their names get recycled and switched through the generations.