  We present the detailed analysis of Hubble Space Telescope observations of
the spatial distributions of different stellar species in two young compact
star clusters in the Large Magellanic Cloud (LMC), NGC 1805 and NGC 1818. Based
on a comparison of the characteristic relaxation times in their cores and at
their half-mass radii with the observed degree of mass segregation, it is most
likely that significant primordial mass segregation was present in both
clusters, particularly in NGC 1805. Both clusters were likely formed with very
similar initial mass functions (IMFs). In fact, we provide strong support for
the universality of the IMF in LMC clusters for stellar masses m >= 0.8 M_sun.
