I am interested in some four-door French Door fridges and am comparing 4 models: one KitchenAid and three Samsungs. I am comparing the fresh food capacity and the freezer capacity. But every website has totally different numbers for the same Samsung models. I checked sears, pcrichard, best buy, ajmadison and Samsung websites and they are all different! Which is right? Are there different ways to measure? thanks.