Mike,
from everything I have seen, if you have your monitor calibration setup correctly, windows 8 should behave correctly and you really should see no difference between Photoshop and Lightroom. You might see differences between Photoshop or Lightroom and internet explorer, which is still not correctly color managed in the latest versions. If Lightroom and Photoshop dont correspond in Windows, it almost always means that you have a bad monitor profile which is surprisingly common as apparently many of Windows' monitor drivers contain corrupt default monitor profiles or they use a profile that uses a microsoft-only type of encoding that Lightroom doesn't understand but that Photoshop sort of does halfassedly. The solution then is to simply recalibrate using your calibration hardware. If you don't have such a thing, delete all profiles associated with the monitor in its properties panel. This will make windows assume sRGB for the monitor and while wrong, at least will be close and will make Lightroom and Photoshop the same. Then go out and buy a calibrator as soon as you can.