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One option that I have used in the past. Calculate the local hash of either the .zip or the actual code. Then create a new object in Pulumi adding additional metadata of say MD5 or something. Then you can add logic to check local hash to remote hash if hashes do not match, then proceed with updating the lambda function.

An idea that I have been throwing around right now is to add a Lambda Tag, such as hash. Then check the tag and evaluate the differences. I beleive this is what source_code_hash is supposed to do, but I have not found out a way for source_code_hash to actually store my value that I calculated. I might be doing it wrong too.