Truffles have hundreds of chemicals in them, it's a complex aroma. Truffle flavour is one single note from this, usually at a very high intensity. It's a different experience.

(note that this is true for many artificial flavors, there's lots of esters often known as "pear" "banana" "strawberry" etc but as I'm sure you are aware artifical banana candy is a long long way from tasting like an actual banana.