Model comparison between POWDERDAY and SKIRT for GIZMO, GASOLINE, CHANGA, and AREPO simulations. The SKIRT run is orange in each panel, and the POWDERDAY run varies in color from model to model (it is this color that denotes which model is which in the bottom panel that shows the relative error). While there are differences in the inherent stellar SED models, as well as the grid construction, the high level of agreement between the output of the two simulation codes is striking.