The Eurasian dove and the white wing dove we have shot for years here in Utah and in Arizona both are generally the same size. The adult white wing is often larger. The Eurasian dove has longer tail feathers. For body size here and in Arizona, both are the same, if both are adult birds and not half breeds.
I don't know about the Utah Euros, but take a look at the pic below. All were shot last Monday near Yuma, with .410 skeet loads, pass shooting over open ground. The two front rows are Euros, The back row is mournings on the left and a few whitewings on the right. Significant size advantage to the Euros. There were seven guys on that shoot, so multiply that sample size by about seven. The biggest whitewing of the day was about the same size as the smallest Euro.
