Since doves and pigeons are closely related these figures can be used for either depending on the setting. Most typically they are considered doves.
There are two versions of the white and blue doves, with a smaller solid base and with a larger base with a hole in it. It's believed the earlier part number for each refers to the solid base. The solid base version is in both hard or soft plastic, with the hard plastic probably the earlier of the two. There isn't a known part number difference between the hard and soft plastic.