These two photos are of the same group, taken at the same time. Maybe somebody moved? Anyhow, the only hints we have is the label, P.B.H.S. and on the back it says; Port Byron H.S. Picnic.
It also lists Reba Pinkney, Chancey Henery, and Leslie Blake. A bit of research finds that Leslie Blake was a 16 year old man in 1910, and Chauncey Henry was 17 in 1910. Reba remains a mystery. I can find a Pinckney and Pinkney family in Mentz about that time, but no Reba. I don’t know who was who, either.