Oder as an interior border in a Victorious Nazi Scenario?

In David Brin's "The Life Eaters" there is a map shown a few times that appears to be OTL's map of the world's year 2000 National Borders with a colored overlay. Is there *any* chance that the Oder river would be a noticeable border between significant parts of the Reich in a Nazi Victory Scenario? I'm trying to see if there is *any* possible Justification for borders within Europe that look like ours...
 
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