You're on a different frame. Audio levels change over time. So there's nothing to be determined with those posted images.
I can say that I've experienced no changes to clip volume when I updated PP.
Could you make an export of the same projet, first from cc17 then cc18 and compare the outputed volume on both ?
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Best guess here is effects. Gain, Volume...something is different between the projects.
Clear of this issue yet, Tomas?
here is link with two raw video clips from camera. (B-roll, Interview)
Maybe works fine on yours systems.
This two clips was tested both versions with default settings.
Adobe 2018 version show audio levels 6 db higher.