These days, salt, pepper, and seasonings are common in sweet foods. At first I would simply substitute the salt in the recipe with MSG. Then, based on how it tasted, the next time I might increase the MSG. To answer your question, yes, there was a difference. But again, it depends on each individual palate. For people who really liked MSG, they liked the MSG sweets, too. For them, it gave the sweets that addictive quality MSG is known for.
