Whole Hog II shows cannot be read by Whole Hog 3, as they are running different software code. If you are looking for a less expensive alternative back-up console to the Whole Hog 3, then I would look into using the Hog iPC running Hog 3PC, or Hog 3PC Standalone.
You can download Hog 3PC Standalone at: www.flyingpig.com/support/Hog3PCSoftwareDownloads.shtml
Whole Hog 3 shows cannot be read by the Whole Hog II. The software on the two consoles is different/incompatible. The best options for a back-up consoles are a 2nd Whole Hog 3 Console, Hog iPC running Hog 3PC, or Hog 3PC Standalone.