Why would you use HFCS as your source to obtain sucrose? You can buy sucrose as is.
To verify that if both break down into glucose and fructose in solution, I should be able to get back the original components in any form I want. I can get back crystalline sucrose from sucrose that has been dissolved in water to break down into glucose and fructose. Now, if HFCS behaves the same way as sugar does in solution, it too breaks down to glucose and fructose in solution. How do I get back the crystalline sugar from this dissolved HFCS. IF you cannot do so with as much ease as you could when you take dissolved sugar, then doesn't it imply that sugar and HFCS really don't behave the same way inside our bodies?
Neglect percentage differences in composition - assume you're using 50:50 HFCS.