I've searched and the only reference on this forum to an "SR808" or "KS808" is your post. I've never heard of them sorry.
KR808 is a family of models. The KR808, KR808A, and KR808B models are
three piece (battery, atomizer, cartridge) models and not cartomizer e-cigs like the KR808D-1. They use a different battery connection to the KR808D-1 and are not compatible. Attached is a pic showing the different KR808
three piece models. I believe you will not commonly find the KR808 sold under it's model number, although it may well be OEM'd and sold under various brands (Smoking Everywhere? etc.). They have not got a reputation for being anything special.
The KR808D-1 is the cartomizer model sold by a large number of vendors.
As I understand it the KR808D-2 is another similar cartomizer model, that uses the same battery connection as the E9 made by a different company (and is compatible with that model).
Most but not all of the models are listed on the Kanger web site -
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