Well there are 40 squares(well circles) on the board plus 4 home space and 4 start spaces. This means that white can take up

48c4 posible ways(sorry can't find my calculator)

That is the easy thing to figure out. I beleive to calculate the number of positions both sides can be on would be

48c4+44c4+x

not sure at this moment how to calculate x. It i caused because the extra 8 positions are seperate for each board. I will have to think more about this when I have slept.