That's one curious finding discussed in this video from the Geography of Philosophy project, along with cross-cultural studies about the objectivity of aesthetic judgments, free will, and the Knobe effect:

An interesting question is what explains the differences?  People born between 1965 and 1984 (Gen X) would in the West would have been living through the globalisation of capital and the triumph of neoliberal ideas favoring market transactions as the basis for almost all of economic and social life.    Should it be surprising that those subject to pro-market indoctrination have more utilitarian intuitions?  Perhaps experimental philosophers will dig further into the surface variations they have discovered.

(Thanks to Steve Stich for the pointer.)