ID-68 is not similar to D76 at all, it's similar to Microphen. Ilford did publish PQ variants of ID-11/D76 in the 1950's and 60's.

Ilford published all their formulae with "Anhydrous" Sodium Sulphite & Sodium Carbonate (after WWII) and there are many mistakes in formulae taken from the Photo Lab Index where the conversions are incorrect, or formulae miss typed. One consequence is that they are a huge number of errors in most US books containing formulae and only those published by Ilford, Kodak etc themselves should be used as references.