I don't measure food given to chickens or ducks, as their needs change seasonally and sometimes even due to weather changes. I just feed once per day and notice how much is left over or if the trough looks like its been licked clean...then I adjust the next day's feeding accordingly.
I have found, though, that it seems as if I feed the same bulk amounts dry as I do wet and fermented in most cases, so if I fed 3/4 gal of feed dry and that satisfied their needs, it seems the same 3/4 gal wet feed did the same, though there is about half the actual feed grains in the wet portion than there is in the dry portion due to the addition of the water within the grains causing swelling of the feed.
So, in the end, go ahead and feed them the same amounts you did when you were feeding dry feed and see how it all turns out....same amount as in wt/cups/scoops, etc.