Both exist but are rare and quirky. I have owned both but I am not where I can access my records so I will try to find it later.
The black clicky ones are on a Mac-layout keyboard with nice PBT keys printed in green ink but in a horrible compressed vertical font.
The white linears are in an ADDS that started with an RJ14 but was convertible once I got the pinout from the controller.
edit - sorry, the green one also comes with white linear, I forgot that I had transplanted blacks into it (strongly NOT recommended!)