They seem a bit similar to me, but a lot of people argue that the answer is "stuffing" and that you can't call it "filling".
closed as primarily opinion-based by Cascabel♦ Nov 24 '15 at 18:33
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I am from Eastern Pennsylvania, where we call it "Filling". Good luck convincing the rest of the world, though. I catch crap for it all the time.
Filling, Stuffing, Dressing....It's all the same, regional dialects aside.