All Sky+ Digiboxes use the same remote control so whichever models you get you'll get the problem of them both responding to the remote control.
A SkyEye device may solve your problem as it would let you control both Sky+ Digiboxes individually in the same room. Check out http://www.skyeye.force9.co.uk/skyeye8h.htm for more details.
Joseph
August 2007