The content on a domain is determined by how the "name servers" are set for that domain. If you have web hosting and setup a hosting account for a domain then you can have content that you add. If you change the name servers for a domain you buy, the content that was on that domain is not transfered to the new name servers.
This may be confusing, so the short answer is that if you push a domain and the name servers do not change, then the content will still show on the domain.