If you genetically engineer a pig to more like a human. When does it stop being a pig and start being a human and given the rights of a person If you genetica

If you genetically engineer a pig to more like a human. When does it stop being a pig and start being a human and given the rights of a person If you genetically engineer a human to be more like a pig, at what point does it stop being a human. I see a future where genetically modified humans grown in tanks raised for their organs, different enough were they are not legally classes as humans and you can farm them.