How to validate the builder function integration in chain_spec file?

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I am performing an upgrade of the Polkadot version from 1.8 to 1.9, which involves updating the from_genesis function to the builder function in the chain_spec file.

I generated one chain spec without integrating the builder function (referred to as old_chain_spec). After integrating the builder function, I generated another chain spec (referred to as new_chain_spec).

I then compared all fields between the old_chain_spec and new_chain_spec. While all fields are identical, I noticed that the code field is different.

Is this approach of comparing both chain specs correct? If so, could you explain why the code field differs between the two specs?

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