Is it possible to easily identify snapshots that are identical?

I guess this is more a btrfs question, probably to do with generation, but if i have a list of backups, is there an easy way to identify which are identical to the previous one? Ie, no changes since last backup.

I was just thinking it might be nice for btrbk to be able to identify those identical backups, if it wasnt too disk intensive to do.

This might be pre-btrfs level thinking on my part because i guess if they are identical they should not be using any disk space.

The issue mentions no files, tests, or entry points. First investigate how btrbk represents and compares snapshots, and whether btrfs provides a lightweight identity or generation check; done means reliably identifying consecutive unchanged backups without an impractical disk-intensive comparison.

Written by the indexing model from the issue text.