For the recipe to taste the same, the proportions have to be mantained.
The original proportion is 10 ounces of soup for every 3 cups of pasta.
In the new recipe, we have 40 ounces of soup, which is 4 times the original, however we have 15 cups of pasta, which is 5 times the original.
So, the proportions wasn't mantained, so the tune would not taste the same.