What determines the New Year's reward I get, and (how) can I get them all?

According to the Prima guide (which is also amazingly unreliable so far), the New Year's countdown gifts from Isabelle vary. To quote their table,

Gift                    Value    Note

Bell knickknack         2,000    Korea only.
Berliner                  960    Germany only.
New Year's noodles      3,500    Japan only.
Sparkling cider           800    North America (English and French) and France.
Twelve-grape plate        480    North America (Spanish) and Spain.

Is the item you get determined by your region, your language, or something else entirely? For example, if I'm playing the German cartridge but in English, do I get the Berliner, or the sparkling cider?

Given the note about "North America (English)" etc, I would assume that this reward is keyed off the language you're playing the game in. But if that's true, does that mean I can't visit a friend using a different region / language to get their item? (Since my game will still be in English.)

Do the U.K. / other European English speakers get sparkling cider or something else?

The game is also available in Italian and sold in Italy. What reward do Italians/Italian-speakers get?

I'm playing acnl in spanish (also the region). The other day i invited some japanese friends to my town and they got the christmas socks. If you want those presents from other region, just find some friends in other countries and ask them to invite you.

The gift you get from Isabelle is determined by your region, just like how you get the limited-time items from the post office. Regarding to your second question, if you visit a friend from a different region, you cannot receive that region's New Year's reward, unless your friend manually drops the New Year's reward on the ground. For your third question, the U.K. and all those other countries outside North America get different prizes. As for the fourth question, it certainly cannot be answered by me. I even tried researching it online, and no successful links have showed up. I hope this helped!