From a biological standpoint, a re-juvenated stem cell and a freshly fertilized stem cell are identical. But how you interpret this is a completely different question.
Just think about the implications: a clump of your cells are “you”, if you want to kill them, you’re free to do so. However, if someone grows a human from these cells, are you still allowed to do that? Is that suicide or homicide? There’s a line between these two examples and where to draw that is an open question.