The Windsor is made by Fuji (in fact the parts kit will come in a Fuji labeled box) so they are almost identical. The Windsor does not have the power diamond down tube despite what BD says, its more of a traditional ovalized down tube. The Windsor also does not have a top tube gusset at the headtube.
Otherwise they are virtually the same...except price of course
PS-the Windsor is a 2008 so it compares parts wise to the 2008 Fuji Tahoe 29er SL...the 2009 Fuji has a few minor parts changes