It sure looks like there are some fairly obvious changes in those two pictures to me...
It’s just that Hubble is that much better.
The originals were taken from ground based scope on a glass plate.
The new ones are taken from space based scope with a CCD camera. The length of exposure would also have an effect.
Your just seeing things better.
Galaxies change over a period of thousands if not millions of years. It takes 250 million years for the Milky Way to complete one revolution. 100 years is just a blink of the eye to a galaxy.