Its not explicitly explained what is the difference.How I see:In app are like modals in the Web. On the top (Z-index: 1000) Content cards are implemented inline with the other mobile app content

Level 10

Question

In app vs Content cards

Its not explicitly explained what is the difference.

How I see:

Adobe Employee

Your summary is correct — just missing the full nuance:

In‑App = Top‑layer overlay messages (Modals / Toasts / Popups)
Content Cards = Persistent inline feed messages (News Feed Cards / Inbox Items)