Many differentiate between those two, pi coin used proof of stake and delegate byzanthine consensus while bitcoin used proof of work to do the job ( validating the transaction ). Pi only another stellar, it is used stellar technology and we dont need another coin like stellar.
It's more likely a scam coin rather than stellar. I don't even know why you are seeing this as another stellar while the fact that if it's still being very far from stellar. Pi is not even live. All of coins traded in the various exchange sites were IOU.
that means if pi is likely a scam coin with only BS promise. Im happy to see police is starting to pay attention to this one. Pi was a garbage coin that will never be real. People just getting brainwashed by wastingtheir energy to mint something unreal.
I think that you shall put differentiate between legit coin like stellar compared with non exist coin like pi coin. The differences from both of pi coin is a scam coin.