Well, I did the reading for you, and the answer is no. The control was a Sierra Leonean and the test was a white American. Page 8 on the paper (click one of the links above).
However, they did not come to the "conclusion" that notNow accused them of coming to. "Behavioral measures are increasingly used to infer cross-national differences in social preferences or to assess aid effectiveness — our results suggest that we should be cautious in these uses."