The difference is that for the git chains it is not possible for anyone to independently verify what the true chain is. You can rewrite history and it will be j

The difference is that for the git chains it is not possible for anyone to independently verify what the true chain is. You can rewrite history and it will be just as correct as the first one. PoW (Proof of Work) makes it impossible to just "replay all the subsequent transactions that happened", because your fake chain will have significantly less proof of work.