마술 means "the art of producing illusions as entertainment by the use of sleight of hand, deceptive devices, etc." 요술 means "any extraordinary or mystical influence, charm, power, etc." 마술 is used for a scientific trick 요술 is used for a mysterious phenomenon

감사합니다! :)

In other words, 마술 refers to magic tricks, illusions, etc 요술 refers to witchcraft, sorcery, etc