The commercial versions of D76 and ID-11 are no longer exactly the same as the published formulae. Over the years the buffering has changed part of the reason for this is that far more people now use it dilute rather than full strength and replenished which was how it was formulated to be used.
Increasing the buffering helps eliminate issues with varied water supplies particularly when use 1 + 3, an Ilford Patent shows the Borax level increased to 3g per litre, in Kodak;s case they use Borax and Boric acid this will lower the pH slightly meaning slight increases in development time.
A Kodak Australia box actually listed the formula as having 4g Borax and 2g Boric Acid.
So you aren't comparing like with like.
Ian
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