To me it looks like the angle of the light is different, probably also the amount of light. Look at the shadows on the wings, on the upper plane it looks like direct sunlight is coming from the upper left side of the plane casting shadows right along the right wing. On the lower image the only vague shadow is on the right rear wing like on a cloudy day and the light seems to come from upper front left.
To make my point I opened the Skin Viewer for the first time in years. There's a slider named Light direction and if you set it to 30% or so you'll get the upper image. Set it to 45% for the lower one.