Here is the aforementioned thread where a member here actually compared the parts and made his own observations.
Factory Tech Separator Plate Kit?
Around post 39 is where the end user took a plate from Factory Tech and one that 'originated' with dirtyd0g, compared them and explained what he saw.
http://www.f150online.com/forums/3320031-post39.html
The whole thread is long, but it's an emlightening read.
Darrin