entypo font stylesheet different to the official version

[lulalala]

For example, a downward arrow are mapped to different CSS classes on WLIF and the official site.

On WLIF, it is called entypo-down-open-big
On official site, it is called chevron-thin-down

So what are actually different? The font or merely the CSS stylessheet mappings?
It would be nice to place a notice so people understand that the difference between the two, saving them the time to modify it later once they host the fonts themselves.

[tobsn]

typicons has a ton more on their page...
http://www.typicons.com