That won't work because the SHA1 hashes won't match up. If you accidentally check-in proprietary or sensitive content that you didn't mean to publish, you can

That won't work because the SHA1 hashes won't match up. If you accidentally check-in proprietary or sensitive content that you didn't mean to publish, you can shun that content. Shunning leaves a hole in your history. There is no way to replace that hole with different content.