I suspect the changes are part of the Rework ALSA UCM profiles work that was merged recently.
The result of that work should mean that that the new default pulseaudio config should be sufficient to provide improved voice call audio without the need for any custom configuration.
Typically what I do on Debian based systems is…
sudo apt update && apt list --upgradeableI then look through the list of upgrades available, if there is anything in the list I know has been customised I then run apt changelog on the package prior to upgrading to try to determine what impact the upgrade may have.
Unlike Debian which will display the changelog of the package version to be installed, with the Librem 5 (and perhaps PureOS in general?), apt changelog will only return the relevant changelog after the package has been upgraded (or at least that was the case when I have tried it previously) which limits it’s usefulness.