So KApro is from Kurt Ader? He used to be the head of KARO sounds in Mannheim. They used to have string libraries for the M3, too. They sampled the Mannheim symphonic orchestra. Obviously KApro is no more under the KARO label, but made by Kurt Ader, as the Youtube user states...
Yes, the same man, the same magic... Korg is blessed having this man making soundpacks for the Kronos..
Tough keep in mind that they are expensive. I was lucky when i bought my used Kronos that those packs where on it...