I do it works well, see below my process/note.
Start menu
Working with default user
Log in as a regular user
Set up the tiles and pin the way you want it
Log out
Log in with your admin account
Open File Explorer
Go to C:\Users\<your regular user>\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\LocalState
Copy file start2.bin
Paste into C:\Users\Default\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\LocalState\
If the destination directory structure doesn't exist, create it.
9) Replace existing start2.bin if it exists.
All this does is to make your regular user layout become the layout for the default user, all new users will get the same layout.
For existing users just replace their existing start2.bin file with your new start2.bin, the path is the same for all. It will work the next log off / log on, itโs not instant.