[Leap 16.0] apache2 group wwwrun or www?

Hi *,

on my Leap 16.0 web server apache is running as user wwwrun and group www, but there also exists a group named wwwrun.
Lately I got a few problems with Nextcloud, when updating modules, because some files had wwwrun:wwwrun set.
So I tried to find out, what the proper group settings might be, but really got confused:

/etc/apache2/uid.conf

        User wwwrun
        Group www

/etc/passwd

wwwrun:x:474:474:WWW daemon apache:/var/lib/wwwrun:/usr/sbin/nologin

/etc/group

www:x:479:wwwrun
wwwrun:!:474:

/usr/lib/sysusers.d/system-user-wwwrun.conf

# Type Name ID GECOS [HOME]
g www -
u wwwrun - "WWW daemon apache" /var/lib/wwwrun
m wwwrun www

What is correct - www or wwwrun?
And why is it different in those configs?

TIA.

Bye.
Michael.