[Freesurfer] skip subjects already processed

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Hello, I have a subset of subjects that were processed with an older version of FreeSurfer and would like to run FreeSurfer in the subjects directory such that it skips all the subjects already processed by my version of freesurfer and only reruns recon-all ... for those aforementioned subjects.

When I do this, will the file structure and files for the subject be overwritten? How does FreeSurfer behave in this case? How does it behave for subjects directories that have already been successfully processed with the same command (including options) attempting to process it at the moment?

Would appreciate any help thanks.

Best, Akshay