Yes you have that right, the network service in RHEL 8 / CentOS 8 / Rocky Linux / Alma Linux no longer exists.  So there is no more systemctl restart network

You can restart NetworkManager but it doesn't have the same effect or ifup/ifdown on all interfaces. 

Generally if NetworkManager is installed you will want to restart it or it won't apply the settings from ifcfg.

systemctl restart NetworkManager

To replicate that the best you can do is type the following commands to nmcli

nmcli networking off; nmcli networking on
 

*Don't forget the semi-colon otherwise you'll go offline if you are connecting to a remote Virtual or Dedicated Server

If you added new IPs/aliases just do this (replace eth0 with your NIC name):

*A lot of RHEL 8 versions like Alma do not have this by default though

ifdown eth0;ifup eth0

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