  We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of
momentum-dependent charge excitations in Nd$_{2-x}$Ce$_x$CuO$_4$ ($x$ = 0.075
and 0.18). The peak position and width of the excitations coincide excellently
with those observed in Cu L$_3$-edge RIXS. It demonstrates that the same charge
excitations are observed at the two edges.
