23 rolls of candy. 11 oz. With so many prime numbers involved, I think the Necco folks are purposefully trying to make their candy packs indivisible! I’m surprised there aren’t 7 wafers per roll. I wonder what the serving size on the packaging is.
They each do the same thing for the same reason every single animal I kill is easily chopped into precisely the same size chunks with exactly the same nutritional value, whether they come from deer, bears, or squirrels. It is a simplification to make programming the game more manageable.
The thing is, even the real world nutritional information printed on package for a single serving is an estimate. Sometimes you’ll get a wafer that has just a tad more sugar or a smidge less whatever-else-goes-in-a-Necco-wafer. Every serving will be slightly different unless you go through great lengths to preserve laboratory conditions. Relax and enjoy the candy! 
Although… I think it could add a little flavor to the game if every item gave +/- 5% nutrition, quench, etc each time you consumed a serving.