Answer:
It depends, if the one that does hard labor had a chance to get educated then yes, it is fair. If he never got the chance to get an education, then no. Why? Because if he did get the chance to get educated and didn't, then he basically chose to do hard labor. If he never got the chance to get educated, then that is unfair because his brother did have the chance.
Honestly idk if that helped, but that's how I see it.