The cables aren't any different and the connector is the same on the 2011 boards and the 2012 boards. High resolution is only what your graphics card can output to your monitor. If a 2012 has a high resolution display and a 2011 board has low resolution display then you will only be able to use a lower resolution. Lcd cables have been the same for years the only thing that changes is the technology they connect to. Unless your talking about hdtv's and monitors where an hdmi cable or Dvi cable is necessary. It's the same cable.
I recently purchased a 2012 unibody and 2012 display and put a late 2011 logic board in it. The only thing that didn't line up was the heat sink. But everything else worked fine. I'm not sure if you were going from a 2011 unibody to a 2012 board. The lcd cable will fit fine either way yet I'm sure you will not have the high resolution with a 2011 display.