They both allow you to create custom maps with pins, but there are some key differences, such as offline access, layer capabilities, customizable pins, and creating/editing within the app. Check out the details on how Google My Maps compares to Lists (including a features comparison table).

There is no separate Google My Maps app, but you can view your maps within Google Maps. Just make sure you’re signed into the same account, and all your maps will sync. 

(There used to be a dedicated My Maps app on Android, but this was deprecated in 2021.)

No, but keep reading for a workaround and alternative. 

One of the biggest complaints about Google My Maps is that you can’t download your custom map and pins to use offline, unlike the rest of Google Maps. 

However, I have been able to use it in areas with spotty reception. I pulled the map up when I did have reception, and I left it running in the background. It would stay loaded in the app and I was able to pull it up to look at it later when I was out of reception. I’m not sure I would rely on this as a surefire workaround, but it can work in a pinch.

Another alternative, especially if you'll be traveling in another country where you'll be completely offline, is to use Google Maps Lists, which can be edited from desktop or your phone but don’t offer the option for separate layers, unique icons, or adding photos.