Bitcoin Cash also has a rule that a specific block (the first one after a specific date and time) MUST be larger than 1 megabyte. If that specific block is smal

Bitcoin Cash also has a rule that a specific block (the first one after a specific date and time) MUST be larger than 1 megabyte. If that specific block is smaller, it's not a valid Bitcoin Cash blockchain. Since that specific block is smaller than 1 megabyte in the main Bitcoin blockchain (because the maximum block size for Bitcoin is 1 megabyte), the current Bitcoin blockchain is not a valid Bitcoin Cash blockchain.