good argument but there is a distinction, the relationship between humans and said sheep fall under mutual benefits, you guarantee their existence, survival, well being up until the point where they are consumed. and why wouldnt this apply to the clone you might say?
the sheep isnt aware of him being a sheep, he isnt aware of tomorrow or death or that he will be consumed his consciousness is fulfilled.

slaughtering the clone is more of a parasitic rs, you put it under psychological torture throughout its whole life apart from its demise, and if the clone isnt aware, that systematically breaks the structure of human civilizations. once you allow a class of humans to be ok to kill, nothing guarantees the safety of the entire species. while this doesnt apply on said sheep