If they have the same ingredients and same form, there will be no difference in the actual result. Vitamin C is vitamin C, there is no better or worse quality vitamin c. (Assuming that what is labeled is what actually is inside, but thats a different problem).
In more expensive supplements there might be more expensive ingredients, but in general you should keep in mind that a high retail price of a product does not necessarily be caused by a high manufacturing cost.
Just because something is expensive it does not necessarily mean that it contains more expensive or better ingredients or is more expensive to produce.
For a potential placebo effect of the supplements, the more expensive ones might have a stronger effect, as your brain expects a better result from the more expensive one. But that is just a result of your brains imagination, and not caused by the actual ingredients (even though this can have an actual effect on your health and state of mind).
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