You can still sort the pie charts by percentage and keep the same colors. This would aid in understanding the differences between the US and Amazon workforces which I believe is the point of using the two pie charts.
Totally agree with you. Second language statistics are a bit harder to track down. It's something I'll look into. English as a second language is probably your biggest help. I'm not sure of any countries that consistently teach Spanish as a second language outside of the Americas.