I'd say for the most part you can ignore. They refer to trim levels, example, Racer, Special, Stone, etc.
-AJ
Where would one find a breakdown of that list?
I ain't think I've ever seen (or maybe ever looked).
But it could actually matter in this case because starting with the V7III the rear fender mounting changed and some models use a subframe and an abbreviated fender while others use the old style larger fender. I believe this means mounting bolts vary back there which might affect accessory/bag mounting.
I would see if selecting any of the sub models gives different accessory part numbers before ordering.
EDIT - poked around and though I'm still curious about the sub-model designations it doesn't look like they mean anything in this application - the SysBagWPs, Urbans, Legends, and Urban Topcase all appear to have the identical part numbers whether you select KV, KV1, or LD, LD1.
On and KV or LD vs KV1 or LD1 appear to be 2017-18 vs 2018-20 (and I don't recall ANY changes to chassis mid 18 year, though again, who knows).
EDIT the EDIT - If I go to AF1 racing and look up OEM parts they have only ONE parts catalog for V7III Stone 2017-2020, though they also have a separate one for the 2019-20 Night Pack, and another for the 2020 Stone S - but none of them fit the Motech website pattern. Though under the V7 Special they have one listed as 2017-20 and a separate one listed as 2019-20. Most of the other specials like the 2018 Carbon Dark or the 2018 Milano, have just one catalog.