Speciation

For the blog this week we were asked to come up with three questions. My questions are about speciation and probability. 

Given a finite number (although astronomical I will agree) of possible genetic variations, and an infinite universe, what if a hypothetical species over eons of evolution developed a genetic code so similar to a previous species that it was capable of breeding with that species. Would they then be the same species, despite being on far distant branches of the phylogenetic tree of life? 

What about an alien species (I am still being hypothetical here) that developed the same exact genetic code despite evolving on a different planet? 

My last question refers to the future of humanity itself. Given what we have accomplished through CRISPR, it seems that genetic manipulation is inevitable, and the future will be a very strange place (as someone who loves the strange, I am quite happy about this). I worry however about our definition of what is is to be "human", as many people throughout the centuries have used that to ascribe personhood. If we develop advanced AI that can interact with us and is for all intents and purposes a sapient, conscious being, I would consider that to be a person. The same goes for any sapient or uplifted life forms we may create in the future, biological or otherwise. I think they should have the full range of human rights, despite not being human by the technical biological term. This goes doubly for human minds uploaded into an android body. As such, will we need to completely revamp the entire way that we classify species in the future? Or should we simply do away with associating ones species with a conscious being's rights? 

I have several friends who are vegetarian/vegan, though I am not, and they would go even further. I always wonder why they draw the line between plants and animals, as plants have a complex system of interaction, they just take a lot longer to do everything. Anyway, this last bit was perhaps me going off on a rabbit trail, but these are things I regularly think about.