One of my frustrations with Chinese and Taiwanese switch brands is their haphazard and disinterested approach to product specifications. Quite often their website is impossible to find, outdated, bewildering, or plain wrong. The Gateron site currently lists five black shell switches — as far as I can recall, it's never cited the series name "KS-3" (I don't know where anyone got "KS-1" and "KS-3" from), and the common type we all know (uniform translucent shell, PCB mount) isn't mentioned.
The types I have are all depicted here (those with my trademark rubbish photos): Gateron KS-3 series
— the five "proper" colours plus the yellow type that seems to have been discontinued and then revived, all in translucent PCB mount shells, plus plate mount black. I don't know if the black one is KS-3 or not.
I don't know what your "white bottom" type is or whether I've seen that type before — I lose track of all these clones. I even have "OUTELO" switches in three different colours and multiple brandings that seem to be clones of Outemu: clones of clones, or maybe it's clones of clones of clones …
Whoever it is who's dealing directly with Gateron ought to try to get some proper details out of them. (I did write a very brief message to Gateron last year, but got no response.)
Part of me would tempted to buy some of each (some multiple of 14 types) but would my sanity survive another round of clones with no known series, no part numbers, no datasheets, nothing … That and I don't fancy trying to photograph moar switches :(