Where are you located?
If these deer where in my area, I would guess that one of them is a 2 1/2 and the other 4 1/2 (yes, I realize that isn't their exact ages at the time of the photo). For that reason, I would say they are different deer. That looks like too much improvement for 1 year, but pictures can be deceiving and some deer just grow faster than others.
If these deer where in my area, I would guess that one of them is a 2 1/2 and the other 4 1/2 (yes, I realize that isn't their exact ages at the time of the photo). For that reason, I would say they are different deer. That looks like too much improvement for 1 year, but pictures can be deceiving and some deer just grow faster than others.