Near subject ramble, not an argument, thanks .. based on my experiences, the Eurasian dove that we see tend to be larger than the white wings when both are in hand. They have a distinct silvery colour to them w/a pinkish blush close to what is seen on a morning dove. Perhaps we are seeing & taking immature white wings, I dunno. I have not noticed any white wings with fat on them when breasted, but many of the Eurasians will have some, so perhaps they are feeding better? Both are 'in town' birds. I have mourning dove, white wings, white-tipped & inter-bred collared dove that visit the feeders at the house. We put out a few hundred pounds of feed per annum at the house, the squirrels, possums & raccoons seem to get at least half of it. I only see the occasional feral pigeon or Eurasian in the back yard & they seem to be coming in to water on a small decorative ground level pond w/a fountain, rather than to feed. I used to frequently shoot white wings in Mexico years ago, but I never had a Eurasian in hand at that time to compare those birds with. Many of the mourning dove we've taken so far this year are immature or this year's birds. Here, there are also white-tipped dove & they seem to be smaller than a white wing, but a bit larger than a mourning dove. We mostly hunt dove in the afternoons, leaving the birds alone to pursue their morning routines undisturbed. In strong winds any of them can do some interesting and elusive antics & birds shot at previously can 'jink in a blink' and beat you & that includes feral pigeons. The pigeons or "paloma grande's" in South America are as wary as any bird out there. They don't appear to be going all that fast, but you'd best double whatever your brain is telling you about lead if you wish to hit one.
FWIW, I never saw a white wing north of the Texas valley until the early 70's and then I saw one in San Antonio around 1972. That was about the time that some of the drag chaining & root plowing began on the south side of the Rio Grand. Today, most of the scrub in that part of Mexico is long gone and producing vegetable crops w/irrigation. I don't know how far north the white wings have migrated, but they are present in the Texas panhandle today.
I don't recall the first time I began to see the Eurasian's out & about in W. Texas, but it has been at least six or more years ago. I've had some smaller grey colored ring-necked dove here in town since the mid seventies & they interbreed with the morning dove.
