The Lessor Snow Goose primarily is taken in the Pacific and Central Flyways. The Lessor Snow is a separate species from the smaller Ross's Goose. Check out any of the field guides and you will note the differences. The Ross Goose is just slightly larger than a Mallard and lacks the black grinning patch that is characteristic of the Snow Goose. The Greater Snow Goose is primarily found along the Atlantic Flyway.
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Blues and Lessers are the same.
They nest separately, they usually feed separately in their own little groups, and you can tell the difference between a blue and snow once they've been skinned or picked. Their bodies look different enough to discern the difference even without the skins!
They also make a different noise when calling, more of a raspier grunt as opposed to the higher pitched honk of a snow.
Observe them in the wild an you will see them doing their own thing never really totally mixing with the snows. Yes, they'll be amongst them but in smaller separate groups.
Dont know where you are watching your birds but here in Louisiana, we get hundreds of thousands of snows,blues,and ross and I can tell you they all roost,fly and die together. Only real seperation you see is from the Specs (whitefront) and snows they dont menigal well at all. We kill a couple hundred a year and we kill the three together all the time.