12.04 - Can I mix sources from different ubuntu versions?

As we know that we are using Repositories for installing packages and repositories configuration file located at /etc/apt/sources.list.

I am using Ubuntu 12.10 (Quantal Quetzal) which reaches End of Life. That means no updates or support. So, the question is, can I use sources.list file from another version, say Ubuntu 12.04 LTS, and will it negatively affect the system.