One service, different words
The service has a title and description. A destination can use those, or a slightly different title on the same YouTube, or a tall poster on Instagram.
Shapes
Posters are prepared in the shapes you need: wide (16:9), tall (9:16), and square (1:1). Pick the one that matches the destination.
Change one
Edit that destination’s title, description, or poster. The other destinations keep what they already have.