Some other questions:
Does the KMAC LE match the KPAD?
What is the difference between the KMAC and the KMAC LE?
Does the KMAC LE support stepped caps lock?
The lighting scheme I would like is to have the Control, Shift and Alt lit in their respective RGB colors; white for the WASD cluster, and red for ESC and Backspace. Would this be possible or are the LEDS only wired for the keys that are shown? Can I turn the lighting on and off whenever I want?
Match in colour or height? colour wise sadly no they are a different shade of titanium, as for height yes and if you get both I can throw in the extra bar that can attach both together!
KMAC and KMAC LE the difference is the LE might have a slight colour difference from the top and bottom part of the housing, as you can see in the pics I have provided there is little to no colour difference.
You can have to support center stem or side stem, right now the placement of the switch is for stepped caps lock only
You won't be able to do the LED lighting scheme you had in mind as the only location for LEDs are Esc, Function row, scroll lock, caps lock, and left control, and yes you can program it to turn it on and off