That makes sense, I suppose. They certainly do have their differences, though. Whereas most /anon/ users are /mlp/ refugees (such as myself), most of /oat/ comes from various different sources such as Ponychan and /b/. I can definitely see where conflict could spring up.
I think one of the biggest differences between the two (if not THE biggest difference) is the attitude towards namefags, avatarfags and tripfags. On /oat/, all of these things are normal and encouraged, with the majority of posters being namefags. On the other hand, /anon/ generally has a certain disdain for namefags that don't actually contribute anything to the board as a whole.
I can see the reasoning behind both of these lines of thinking, which is why I save all of my namefaggotry for /oat/, while my posts on /anon/ are almost always anonymous. With the exception of when I'm hosting Clop General, of course.