adamah:
DON'T look at the ice mass, as most viewers are going to do. Instead, take a point on the landmass (green, say the tip of the penisula) in the lower RIGHT corner of one of the pixs and take another point (say, one of the brown islands) in the lower right corner of the same pix, and measure the distance between these two points on your screen. Now, measure those same two fixed points on the other image, and compare their distances.
Comparing straight-line measurements of landmasses on different parts of the globe (or the same part of the world from a different perspective) receding away from the viewer does not give a reliable indication of scale, because the landmasses are on a curved surface. However, features nearer the center of the images (i.e. near the part of the 'globe' nearest the viewer) are the same size but with different rotation (about 6.8 degrees anticlockwise for Banks Island and Victoria Island in northern Canada). The zoom factor is the same for both images. As previously stated, the images have slightly different rotation, but the elements you labeled '1' and '3' are not applicable, and the different rotation is not enough to make the icemass 'appear' significantly larger.