Comment by Postosuchus

You have to be specific what you mean by "ads" then. If you mean creatives that ultimately rendered - you are absolutely correct. I don't have any stats handy to check the ratio between the two to estimate the number of unique creatives, but I believe it is a) several orders of magnitude smaller but b) still very very large.

And again, we are talking about logical creative (the actual visible part). Click URLs and such will definitely be different.