Below is the comparison for Neato XV-11 vs XV-12 Automatic Vacuum Cleaner. You can check the detail information about those vacuum by click the link below.Actually there is no difference between the Neato XV-11 and XV-12. Both reserve the same features and capabilities. The only difference is the color and marketing purposes only (in this case including the Neato XV-15).
Neato XV-11: green, North American Model
Neato XV-12: white, North American models exclusively for Target
Neato XV-15, blue, Europe only models
But now the Neato XV-11 and XV-12 you can get them on Amazon.com. You tend to get a lower price, if bought on Amazon.