What kind of maple is this leaf from?

I found this beautiful little maple seedling a href="http://i55.tinypic.com/23ly2ip.jpg" rel="nofollow"http://i55.tinypic.com/23ly2ip.jpg/a growing in one of my outdoor flower pots here in Brooklyn, NY, and took it inside to save it from the scorching sunlight and apparent insect/slug predation. A few days later, I found this set of maple leaves a href="http://i55.tinypic.com/r8b236.png" rel="nofollow"http://i55.tinypic.com/r8b236.png/a resting on top of some firewood in the back yard. I'm wondering if they're from the same tree that spawned my seedling, but the leaves look something like silver maple, while my seedling looks like red maple (can't wait til autumn!). Hope someone can verify my identifications since I'm still a novice in botany.