I had a quick look at the manuals for both boards. They both allow
MIDI control using
MSC. The whole hog says it should only be connected to another whole whog. There is a technote about whole hog II's earlier then a certain serial number requiring a modification to make the
MIDI work. Someone like DigitalTec might be able to help you set the right messages. There could be a lot of work in this and it is quite complicated. One of the first things to do is get the manuals for both boards and read up the sections on
MIDI control.
I would really like to know why you need to run these two boards as the Obsession with the latest software can operate moving lights.
Just another suggestion if you haven't already I would probably post this under the lighting question forum where more lighting people might see it.