It's hard to say for sure, but I find the difference between "cold" recall and latent recall of facts to be pretty large. Happens most frequently with stuff I learned on Wikipedia: I'll end up in a conversation, find myself knowing a fact that I shouldn't really have known given my background, and then realized that I must've gotten it from Wikipedia. Sometimes after that I can mentally recreate the browsing path I must've used to get to the fact, even though I wouldn't have been able to explicitly list the article in question as one I remembered reading.