Copying AD Users and Computers from Windows Server 2012 and Adding it to Windows Server 2016

Yes, basically the same steps.

so i don't mess around with the 2012 server

Wow, you're creating a ton of unnecessary work. If it were me I'd use dcdiag / repadmin tools to verify health correcting all errors found before starting. Then I'd stand up the new 2016, patch it fully, license it, join existing domain, add active directory domain services, promote it also making it a GC (recommended), transfer FSMO roles over (optional), transfer pdc emulator role (optional), use dcdiag / repadmin tools to verify health, when all is good you can decommission / demote old one.

Worst-case you don't move any roles right away. Then if for some odd reason the 2016 server went south you would simply power it off and do cleanup to be exactly where you are right now.

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc816907(v=ws.10)#bkmk_graphical