Are these sunflowers?

I had planted and grown sunflowers two summers ago and tried to harvest the seeds and dry out the heads and plant those seeds for new sunflowers. Never wound up growing anything but now in the same spot where I tried to plant them all that time ago these popped up and based on the leaves and buds starting to form I thought they were sunflowers but I'm not sure. Might also be from birds eating seeds because several of my neighbors also have sunflowers. Thanks in advance for any answers.