I believe "LSSD" is from the Davis area of Los Santos and their name I suppose is Los Santos Sheriff's Department (which may also be why they have a Sheriff station in the city) and "LSCS" I guess is the jurisdiction of Vinewood Hills mostly and the surrounding areas of the county simply because of "county" in their name. Did you try activating them as your jurisdiction to see what their active radius is for call-outs? I haven't tried myself, but maybe you can try it out and check the map to see if it makes a difference. See if the call-outs spawn around Davis and of course the County. it seems like they're the same thing, but have different jurisdictions and their abbreviations I guess can be similar, but my only logical explanation is that Rockstar Games were too lazy to add details about having a "BCSO" station and their vehicles, so I guess they just scrapped the Blaine County Sheriff's Office idea, but thanks to modifications, we have them now. I don't know if they were actually going to make an official "BCSO" department for the game, but it would have made sense. Overall, it doesn't really make much sense, besides "LSSD" technically having jurisdiction in the city as a Sheriff and "LSCS" also having jurisdiction in the county as a Sheriff too.