[arch-general] same packages with different letter case in names?

[Sergej Pupykin]

Hello, All!

What difference between

x86_64/koffice-l10n-en_GB-1.6.3-2.pkg.tar.gz
x86_64/koffice-l10n-en_gb-1.6.3-2.pkg.tar.gz

x86_64/koffice-l10n-pt_BR-1.6.3-2.pkg.tar.gz
x86_64/koffice-l10n-pt_br-1.6.3-2.pkg.tar.gz

in [extra]?