Does latin1 have performance benefits over utf8?
Short answer:  Don't bother.

Long answer:


https://bugs.mysql.com/bug.php?id=84440 -- you may or may not save space.
InnoDB is inherently bigger than MyISAM.
Comparing characters in utf8 is slightly slower than in latin1.  But you will probably not notice.
The tiny difference between 1741668352 abd 1810874368 is probably due to the random nature of how you build one table from the other.  Or the phase of the moon, not something significant.
The 30 vs 31 comes from how InnoDB estimates things.


Do not use CHAR except for truly fixed-length strings.  Almost always they are ascii, such as country_code, postal_code, UUID, hex, md5, etc.

Get in the habit of explicit saying ascii or utf8mb4 when you create the column/table unless you have an unusual case where you need something else.