I dont think I could work out the coefficient even with the formulas
to work out the percentage - but im sure someone here has breeders assistant that maybe able to enter the names in for you maybe to work it out.
Personally I wouldnt do that mating - only because I dont think there is any need with the diverse lines that are out there. and I would only expect it to be done by an experienced breeder who knew the lines inside and out.
Being a new breeder myself I cant really add much more then that but hopefully someone else can.