Question

Compare ozymandias with last duchess

Answer 1

Guessing this is an essay:
You will need to say what their themes are, both have the theme of art to tell the story, then ozy is about nature is more powerful than humankind and duchess is about power of man over woman:
Here is a link which may be more useful
https://youtu.be/o3azNzZWo3g
Hope this helps

Answer 2

Both , both however structure