Saheb and Mukesh are two different characters in the story "Lost Spring" by Anees Jung. They are both children who live in Seemapuri, a slum in Delhi, but they have distinct differences which are highlighted in the story.

Differences between Saheb and Mukesh:

1. Background: Saheb is a refugee from Bangladesh and has no legal identity or citizenship. In contrast, Mukesh is a native of Delhi and has a birth certificate.

2. Education: Saheb is illiterate and has never been to school, while Mukesh attends a government school.

3. Work: Saheb works as a ragpicker and helps his family earn a meager income, while Mukesh works as a waiter in a tea stall.

4. Aspirations: Saheb dreams of going to school and becoming a doctor, but his lack of legal identity and poverty make it impossible. Mukesh, on the other hand, has low aspirations and is content with his job as a waiter.

5. Attitude: Saheb is optimistic and determined to improve his situation, despite the challenges he faces. Mukesh, on the other hand, is resigned to his fate and does not have the same level of motivation.

Overall, Saheb and Mukesh represent two different outcomes of poverty and lack of opportunities. While Saheb is resilient and hopeful, Mukesh has resigned himself to his circumstances.