Dcress,
You can use crime-scene techniques by getting the head size the same first, then measure eye width, nose length, ears how they sit, etc. Or, on a clear film lay one photo over the other.
And I would angle the 'general' picture down a bit as to get the measure--as his chin is up in that one whereas the junior rank early photo is slightly down and chin tucked a bit.
And, this would account for the different shadows on the face--which will eye trick you as you see shapes...not forensic evidence.
M. E. Wolf