Korban Metzora for Another: Neder or Kaparah?

When one undertakes to bring a korban metzora on behalf of another, what is the nature of that obligation: a personal neder, or a din in the metzora’s kaparah?Through a focused analysis of the Rebbe and the Rogatchover, this shiur uncovers a novel approach: two parallel dinim coexist, with practical ramifications in cases such as a wealthy donor bringing the offering of a poor metzora.לקוטי שיחות, חלק כז, מצורע א