English KoF2000 was a special release by SNK-Japan and NeoGeoFreak.
As for English Kizuna Encounter:
Here I am back in January 2002, for the rebirth of stock shipment holding a 6 pack of Kizuna Encounter cartridges.
As I said before, I personally think the English Kizuna Encounter had a production run of closer to 500, but for sure a minimum of 100+. Other aes releases (common games) had runs in the 1000s-5000s.
To put it into perspective, the official NGF Zupapa had a production run of 500 copies. Yet it is impossible to find. When was the last time anyone has seen one for sale or in person? Extremely rare title at only 500 produced.
Same for NGF releases of:
The official Zupapa!
So if Zupapa is extremely rare with 500 copies, I think it is safe to presume that titles such as Kizuna Encounter have way more than only 10-20 copies (as posted by other silly neo sites). No company would waste the time, effort, and money to do anything less than 100-500, and/or possibly more.
First big stock shipment: http://neogeofreak.com/stock/stock1.html
Second "Rebirth of Stock" http://neogeofreak.com/stock2/stock2.htm
Zupapa FAQ: http://www.ngfusa.com/zupapa/zupapa.htm