How do i get installer user-id?

I have a project whereby i have to extract configurations from one linux pc and emulate it on another.

I am focusing on extracting the packages installed during the installation of the fedora. This link: Fedora replicate package helped me to extract the packages installed by the installer during the initial setup. However i have no idea how to get the installers user-id so that i can sort the packages installed initially and packages installed later on by the admin

1 ) How can i get the installers user-id?

2 ) Is there any open source software which can help to extract cofiguration from one linux pc and emulate on another?