Celebrim
Legend
If the products of childbirth, cloning, and manufacture are all sentient, why should the process matter? It seems to me like you're positing some kind of inherent hierarchy between the different methods because of, what, raw material?
I very much do differentiate by the mode of creation. To simplify here, in the US Declaration of Independence, Jefferson writes a line about "All men being endowed by their creator with certain inalienable rights...". Whether you read that as a personified creator or as Jefferson probably did as indifferent nature, the point is that the mode of creation sets the rights and dignities that apply to the being. While a domestic servant droid could be conceivably as misengineered as NDR-114 so that it wants to be human and have human desires and somehow is actually capable of that (but why?), normally the rights endowed by the maker of a domestic servant droid would include things like, "Free from unnecessary pain or denigration or abuse" but not "Voting for the government" or "liberty" or "pursuit of its own happiness". Indeed, properly engineered such droids wouldn't even want those things as being incompatible with their nature. To violate those principles would lead to both unhappy droids and unhappy droid makers, leading to a Butlerian Jihad or Terminator situation as we have essentially fully incompatible alien species.