Great reseach, and a surprisingly big difference in tred pattern and depth I must say.
But are you sure there only one 245/35/20, the K1 version, because I'm seeing normal vertion too, but with a 91 load index.
http://ssl.delti.com/cgi-bin/rshop.pl
http://dekkmann.no/no/priskalkulator...medlemskap=NAF