Install on new domain from old domain

Hey.
I have Litecart installed and want to use it on another domain on same server. I have done a lot of changes and modules I dont want to do again. So must I install it on the new domain or can I just copy all files ? If so, what files do I have to change, with paths and domain name ? Or do I have to install it ? If so, what files should I not copy to the new domain from the old domain ?