Both poems have many similarities, but a thing that stands out is the subject as the subject is what the poem is about. They’re both about break ups, we know that they are about break ups as for the poem ‘when we two parted’ the clue is in the title as parted means they are breaking signifying that this poem is about a break up. I think this is a good trait as the reader instantly knows what the poem is about and does not have to guess about what they think the poem is about.