Not saying you couldnt get the 800 filter to fit but I am holding both in my hand currently at the shop. The 800 is a deeper filter with much more space between the threads and the filter housing than the 1200, and the ridges around the rim for a filter wrench are quite different. Hence why I have two different filter wrenches for the 1200 and 800... different filters.
these are OEM filters I am comparing
Girthy Knobkers screwed with this post 11-27-2012 at 12:19 PM
Reason: adding info