Did you answer the question? Your answer to "how are they different?" was... "they're different".
Children have been working in dangerous environments since the dawn of humanity. Genuinely interested in why you think the industrial revolution and X years old is where we should draw the line.
Because we reach a certain point where it's possible and reasonable to do so.
The ultimate goal of humanity should be UBI and all humans living a content, peaceful life in which they can pursue the things that interest them.
But because of evolutionary behaviours that result in things like capitalism, we'll never reach that goal. I'll say it now: humans are currently biologically incapable of sustaining a true utopia.
Children have been working in dangerous environments since the dawn of humanity. Genuinely interested in why you think the industrial revolution and X years old is where we should draw the line.