As part of the FIRE project, we have simulated a large number of galaxies that resemble the Milky Way or Andromeda, including some “Local Group” systems which include both, together, like our own neighborhood. Shea Garrison-Kimmel has compiled a large number of movies of these different systems, side-by-side, such as the example shown above. His page (with a huge number of different movies showing the gas and stars in all these systems or each of them at a time). This allows you to see the diversity of formation and merger histories, that produce galaxies broadly similar to our own today.
The direct link to Shea’s page is http://www.tapir.caltech.edu/~sheagk/firemovies.html