Well, thank you for your reply Michael.
Now I guess there is nothing left to do but grieve.
It is too late for me, but maybe someday, computer backups and encryption will be "less art and more science".
Just a note: maybe LUKS could someday add a feature that would check before restoring a luks2 header, and alert the user that they are trying to restore to a different disk than the header was backed up from, or to a disk that does not appear to contain LUKS encrypted data.
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