sytem group sambashare seems to have changed gid from 122 to 124, will it change in future?

New intalls show sambashare with gid=124. I see and have from older installs sambashare with gid=122. the newer installs have rtkig at gid=122. older at 117
Is this normal that system group names are having their gid changed? Seems a potential source of errors and confusion.

new server:
   @lx4: ~$ cat /etc/group | grep rtkit
   rtkit:x:122:
   @lx4: ~$ cat /etc/group | grep sambashare
   sambashare:x:124:rwcalg,kathy,rwcalg2
Old servers:
   @lx3:~$ cat /etc/group | grep rtkit
   rtkit:x:117:
   @lx3:~$ cat /etc/group | grep sambashare
   sambashare:x:122:rwcalg,backupuser,kathy

   @aglx2:~$ cat /etc/group | grep rtkitd
   rtkit:x:117:
   @aglx2:~$ cat /etc/group | grep sambashare
   sambashare:x:122:rwcalg,kathy,backupuser,rwcalg2

I noted this because for several years I've use sambashare as the group for media files to be shared in our home network between users. A bit ago, I started seeing rtkit showing as the group when viewing the files on an nfs4 share which uses uid and gid rather than names. The reason now is clear. I can easily go and:
1. change the gid of sambashare to 124 on machines where it is 122
2. use find to change all the files / folders with gid 122 to 124 for those machines
for the medial files:
  sudo find /mnt/AUDIO -gid 122 -exec chown -h 124 {} \+
however, if rtkit is in use on those machines will this break something. On my wifes desktop, Audacity won't work for her user but will for my id. I wonder if this is the cause. DOES anyone know of a way to trouble shoot that.

Ideas?