0g sugar per 60g serving size. Do I now conclude that you were trying to fool me into thinking oatmeal contains less sugar than cereal when in fact it contains much more?
No, that's nonsense, oatmeal is a kind of cereal. The amount of sugar in it isn't even related to whether it's oatmeal.
And even 1g per 40g is double 2g per 40g, not 'nutritionally identical'.