The difference here is that unlike post-Columbian chattel slavery, Roman chattel slavery wasn't based on a racial caste system that positioned European Romans above the African and Asian ones. In fact, the northern Germanic Goths, Celts, and "Barbarians" probably would have been lower on their social hierarchy for most of Roman history than most MENA Romans (except maybe Jewish people, and the early Christians before Constantine started the process of introducing elements of the very pagan Sol Invictus cult into Christianity).
The difference here is that unlike post-Columbian chattel slavery, Roman chattel slavery wasn't based on a racial caste system that positioned European Romans above the African and Asian ones. In fact, the northern Germanic Goths, Celts, and "Barbarians" probably would have been lower on their social hierarchy for most of Roman history than most MENA Romans (except maybe Jewish people, and the early Christians before Constantine started the process of introducing elements of the very pagan Sol Invictus cult into Christianity).