Facebook documentation writes:
"App Installs
Drive more installs of your app by linking directly to the App Store and Google Play Store. You can also choose to target high-value users."
"Conversions
Encourage people to take a specific action on your business's site, such as having them to add items to a cart, download your app, register for your site, or make a purchase."
I understand that both can do AEO but what's the difference if there is one?