Not analogous. Sons are practically obligated by family (and indirectly by the immediate society) to marry even against their will for keeping the tradition. Also females were considered unfit to get married after a certain (very young) age creating a pressure on girl's family to find a groom as early as possible. People created pseudo scientific and religious basis for enforcing these.
It was a social evil has rightly been banned but slavery was both a social evil and individual maliciousness on part of people who partook in it - and there were a few black folk too in that group who were selling their own people. No society 'mandated' slaverer to sell people as a way of life. There were always other professions if it didn't fit well with their conscience. No one would make your life hell for not actively selling slaves by making you into a social outcast.
It was a social evil has rightly been banned but slavery was both a social evil and individual maliciousness on part of people who partook in it - and there were a few black folk too in that group who were selling their own people. No society 'mandated' slaverer to sell people as a way of life. There were always other professions if it didn't fit well with their conscience. No one would make your life hell for not actively selling slaves by making you into a social outcast.