You are analyzing the uranium reserves of two major uranium producers, Cameco Corporation and Kazatomprom, for the fiscal year 2023.

Requirements:

1. Cameco reported uranium reserves of 500 million pounds at the end of 2023. Kazatomprom reported uranium reserves of 400 million pounds during the same period.
2. Calculate the difference in uranium reserves between Cameco and Kazatomprom.
3. Discuss the significance of uranium reserves for Cameco and Kazatomprom in terms of market dominance and future nuclear energy prospects.