What is the difference between these two lists?

What is the difference between these two lists?

Here are two similar but different lists.

List #1
1-English
2-Mandarin
3-Hindi
4-Spanish

List #2
1-Mandarin
2-English
3-Spanish
4-Hindi

Do you know what the difference is between List #1 and List #2?

Correct answer will be given in a few days (Wednesday).

Updates
6 mo
Here is the answer you've been waiting for...

List #1 is the most spoken languages on earth, ordered by the number of people who speak each language.

List #2 is a similar list, but only considers native language speakers.

The list shows that Mandarin is the most common native language in the world, but English is the most common spoken language. The lists basically show that many people are multi-lingual.
What is the difference between these two lists?
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