The Mourning Dove is smaller in size and has deeper shades of brown. Its tail is pointed.
The Eurasian Collared Dove which has worked its way northward from the Caribbean, is a larger bird and is lighter in color. It also sports a red eye and black collar around the back of its neck. It sports a square cut tail.
Both of them frequent my feeders and the collared doves have a huge flock numbering in the 20s.