These are the leaves of the tree just shown. Compared to the leaves shown earlier, these have a much wider lobe - lobe being the part of a leaf that sticks out, while the sinus of a leaf is the depression created by lobes. Think of the cavity of your own sinus. This type of within-species variation is very much typical of oaks, just like the vastly different catkin colors. This is very normal for oaks, and is incredibly (and understandably) frustrating for novices at oak identification. Oaks reveal their secrets only to the observant.