utf8 vs UTF-8

[Troels Arvin <troels@xxxxxxxx>]

Hello,

In a Postgres installation, I have databases where the locale is 
slightly different. Which one is correct? Excerpt from "psql --list":

 test1       | loc_test | UTF8     | libc            | en_US.UTF-8 | 
en_US.UTF-8
 test3       | troels   | UTF8     | libc            | en_US.utf8 | 
en_US.utf8

OS is Ubuntu.

--
Kind regards,
Troels Arvin