Settings with excluded races? The MtG books generally restricted the races, stating the PHB races (or perhaps just most of them) are unknown in the settings unless visiting from other worlds. So you won't find gnomes, dragonborn, or tieflings in either of them (though really, tieflings would fit well with the Rakdos so I wouldn't be surprised if many DMs added them to the setting).
Forgotten Realms has always been a kitchen sink setting, and Eberron has generally been a setting of "if it exists in DnD, it has a place in Eberron", so no surprises that neither of those have race restrictions.