Here's another Herschel (Hi-GAL) vs. Spitzer (MIPSGAL) comparison. This time the image is closer to the galactic centre towards the constellation Aquila (about 30° galactic longitude).
Spitzer (can be seen in the Milky Way Explorer here):
It should be noted that a significant reason for the differences in the Spitzer and Herschel images is the colour ranges and luminosity levels chosen by the people who rendered the data. If you copy these images and run histogram equalisation on them in a graphics program, you will see that the underlying data are more alike than is first apparent.
Still, there is no doubt that Herschel reveals more detail, especially in the colder dust, than Spitzer.