Some languages have interesting variations on S, C, O and Z (there might be more, I'm not a keen linguist). However, the accents are not always the same. I also believe that nobody has "ğ/Ğ", and I'm pretty sure that nobody has "ı/İ" pair.

The second one wreaks havoc on many, many systems. e.g.: It was breaking Kodi completely (https://github.com/xbmc/xbmc/issues/19883#issuecomment-86833...), and I have personally wrapped many software packages with locale change scripts to make them run.

For more information: https://blog.codinghorror.com/whats-wrong-with-turkey/