High Fructose Corn Syrup is manufactured with the use of yeast — a type of mold.
Yes, both sugar and HFCS are combinations of fructose and glucose, but HFCS is called “High” for a reason, because the percentage of fructose is higher. The body doesn’t process fructose the same as it does glucose.
I buy Mexican coca-colas occasionally. The local grocery stores here carry them, but only in the Mexican food sections, so you have to know where to look! Mexican cokes are made with sugar. Maybe the sweetness is the same, but the Mexican cokes have a cleaner, more refreshing feel to them.
I'm not sure if what you say is true (it could be - I just don't know), but yeast is most definitely NOT a mold. It is a fungus.