You are analyzing the platinum reserves of two major platinum producers, Anglo American Platinum Limited and Impala Platinum Holdings Limited, for the fiscal year 2023.

Requirements:

1. Anglo American Platinum reported platinum reserves of 50 million ounces at the end of 2023. Impala Platinum Holdings reported platinum reserves of 40 million ounces during the same period.
2. Calculate the difference in platinum reserves between Anglo American Platinum and Impala Platinum Holdings.
3. Discuss the significance of platinum reserves for Anglo American Platinum and Impala Platinum Holdings in terms of market positioning and future growth opportunities.