Deleting snapshots from qcow2

I'm currently writing a script I can invoke from the command line to delete old snapshots in a qcow2 file. I often have more than 10 old snapshots.

If I have an arbitrary qcow2 for a VM with arbitrary snapshots going back some months, is there a difference between deleting snapshots from oldest to newest vs newest to oldest?

My intention is to keep the most recent two snapshots, but discard all others except those that don't have the word "PROTECTED" in the description for the snapshot...

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