You can do separate dip switch settings on each one.
So, if you wanted one Galaga version to be regular, and one to have the rapid fire, you could. You can also do this with the Pacs if you want regular or speed up. It's actually a nice feature of the 60 in 1. My daughter loves the speed-up Ms. Pac. I hate it. So, when I had a 60 in 1 going it was nice to have two versions that we could choose from depending on your tastes.