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by XR0CSWV3h3kZWg 3100 days ago
In terms of how chain splits work there is not a technical differentiation between a "fork" and the "original". In the case of the hard fork on block 478559 there was a pretty significant change to the consensus rules (EDA, 8MB blocks & no segwit).

What happened on block 494782 was also a fork in some respects, there was well telegraphed plans to change the consensus rules on that block, but no one mined/accepted blocks with those rules.