Your Forma may have had more updates than your Aura, and this may have lead to unnecessary files left in the rootfs partition during updates.
I say that just because it's the only possible cause I can see... Is it true? Well, I don't know, but what I know is that during updates, the KoboRoot.tgz is extracted to the rootfs partition, without completely wiping the previous update, just replacing old files by new files if there's an update.
Hope you'll resolve your problem!
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