You can network the two machines with the ethernet cab;e but I'm not certain Migration Assistant will work. Just be wary that Migration Assistant isn't perfect so refrain from using it for apps and some settings. It's great for basic data such as documents, music and pictures though.
Alternatively, you can do it all manually by literally dragging the contents of the following folders to their equivalent locations in the new machine: Documents, Desktop, Pictures, Movies and Music. That's a pretty good start and can definitely be done via ethernet.