In pre-4.0 versions of the CC licenses, they produced "ported" versions that were intended to adapt the general principles of each license to the specifics of each jurisdiction's norms/terminology. 4.0 seems to have dropped that and written "international" licenses instead.

Interesting question. I clicked through the link on the country flag and found this page: [1]. Relevant extract:

In the past, when it was demonstrated that a ported license was needed, Creative Commons worked with experts to craft a localized version of its six, core international licenses. Over 50 ported license suites exist. These ported licenses are based on and compatible with the international license suite, differing only in that they have been modified to reflect local nuances in how terms and conditions are expressed, drafting protocols and, of course, language. They are effective worldwide, as is the international license suite.

[1] : http://wiki.creativecommons.org/CC_Affiliate_Network

Different countries have different laws and language.

NZ differences from England and Wales (seemingly out of date): http://mirrors.creativecommons.org/international/nz/english-...

For example, you'll see that "attorney" is not a term of the art in NZ, and "adaptation" is preferred over "derivative work" to bring the terminology in line with NZ law.

For other versions see http://wiki.creativecommons.org/Jurisdiction_Database