Pretty sure mod_auth only accepts a local file_path for AuthUserFile, so your best bet woud be to either mount a shared area on one server and have your htpasswd file be located in there, or use something like cronjob+rsync to sync them every 30-60 seconds or as often as you need it.
A more advanced method would be to use and configure mod_proxy for your site on one server to load as if it were located on the other.
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