Nakamoto consensus doesn't work across chains. Only among multiple valid branches of the same chain.
Hm. This is a confusing topic I think. Satoshi said one could use pow to vote on new features
Miners that voted for new rules will enforce them on their own chain, and miners that did not vote will continue to enforce old rules on their own chain.
I think that he said that the votes can be used to enforce any new rules. But it cannot force my mining node to accept an invalid rule.
