Final answer:
The use of the smile metaphor in the given text excerpts does not directly compare two specific nights, but it does highlight different emotions related to nights. The closest metaphorical use of a smile to describe the night is found in Walt Whitman's work, representing a welcoming and pleasant night, contrasting with the grim smile in Wilfred Owen's poem.
Step-by-step explanation:
The smile metaphor referenced in the question seems to compare contrasting experiences of nights in different contexts by different speakers. Looking at the cited texts, we don't find a direct comparison between two nights using a smile. However, the closest instance where a night is personified with a smile is found in the first verse, which belongs to Walt Whitman's "Leaves of Grass":
Smile O voluptuous cool-breath'd earth!
This line personifies the earth, comparing it to a lover that the speaker is calling to smile, which suggests a sense of welcoming and pleasure. This can be contrasted with Wilfred Owen's "Strange Meeting" where the night is associated with a "dead smile" suggesting a negative, unwelcoming, and grim visage.
In summary, while Whitman’s line features the earth at night with a smile, there’s no direct comparison of two smiles representing two nights in the given excerpts. Instead, the smile metaphor in different poems represents various emotions and settings associated with night-time.