1 liter of 10% Hypo is 100 g/l and added to D76 will result in 50g/l of Hypo and 1/2 of the rest of the D76 ingredients just by dilution alone. This will ruin the developer. If you substitute DTOD with Hypo, you would use about 1 - 2 g/l of Hypo in the D76. But then, look at the other developer. It has Bromide in it as a restrainer which changes the action on the film totally.
So, they are not interchangeable nor are the amounts of hypo useful - unless you want a monobath. Hah!
BTW, look at the HQ amounts in the two developers. That should give you some hint that something is different!