ORIGINAL: early in
Sorry, but the leaves on the small tree in the fourth pic (Red Oak)are NOT the same leaves as are in the previous pics. The leaves in the first pics are more rounded than the "pointy" leaves of the last pic.
I agree completely that the leaves look different, but juvenile leaves of a lot of trees do not look like they 'should'. You can even see major differences in leaf form sometimes of leaves from a single tree depending upon the position in the tree's canopy, so they may very well be from the same tree.