You can discover a lot about a poem by comparing it to one by another author that deals with a similar subject. You could compare features such as theme, form, structure, rhythm, language and figures of speech. Consider how each writer’s use of form links to the meaning of their poem.
The key thing to do when comparing poems is to make a list of similarities and differences between the two poems.
Comparison of 'Love and Friendship' by Emily Brontë with 'Long Distance II' by Tony Harrison