[JasonC]

The only thing I am unsure about is whether that white area in the right side photo (bottom one) is a built up area, or just a sandy or salt-flat-ish dry creekbed. If the second of those, the difference between the two pictures may just be recent water flow related. A closer look at the white area alone might distinguish.

[JasonC]

Notice, for instance, the long thin white areas parallel to the river in the right side photo (last pair). Those might be sand. The white blob in the middle left to right, third from the bottom top to bottom, is along a smaller stream, and might be a wide sandy flat aka dry pond.