Your original stance was that it is “problematic” to equate them. Do you think it was problematic for Fredrick Douglass to equate them? If not then your original position has to change.
We don’t have polling on prior chattel slave views on wage slavery, but since you’re making a habit of just going with your gut, I’ll do the same. I’d wager most prior chattel slaves would’ve been more than happy to abolish all forms of slavery (including wage slavery).
You really think “part of nature” is a good argument for if something is morally acceptable? You can’t think of anything that happens in the natural world that we choose not to do as civilized moral agents because it’d be wrong to do?
https://en.m.wikipedia.org/wiki/Appeal_to_nature