The find command returns all files in a backup set that matches the file filter (and * is any file, so everything that is included in the backup version is returned, changed or unchanged doesn’t matter).
To see what’s changed in a backup version (version 0), compared to the backup version before it (version 1) using the compare command:
duplicati-cli compare ssh://username:password@1.2.3.4/home/Backups/R1/OfficeMac/HD2 0 1 --ssh-accept-any-fingerprints --verbose
The --verbose options lists all files that were new, modified or deleted in the base version (0) compared to the other version (1). Without --verbose, only the first 10 new, modified and deleted files are listed.
You can compare any 2 versions, so if you want to know what happened to your files between backup version 5 and 17, replace 0 1 with 5 17 in the command above.