How to import and export admin users on Magento 2?
Your admin users data are on the tables admin_user and admin_passwords in your Magento 2 database, you can use these commands to export and then import in your second store:
$ mysqldump -p --user=username dbname admin_user admin_passwords > myAdminUsers.sql
$ mysql -u username -p -D dbname < myAdminUsers.sql
If you use a database prefix, don't forget to use on these commands above.