I see, well the idea is to replace the Micro controller on my Ducky2108LS (essentially a Ducky Zero with LEDs on every key) and since it has 108 keys it looks like I will need to use the Teensy 2.0++.
If you are not at the level of a professional Electrical Engineer at electronics and microcontroller programming, I would advice against it.
The backlighting on the Ducky keyboards is done by digital circuitry in combination with the existing keyboard controller and a Teensy chip can not replace it outright.
I also think that the actual microcontroller chip is surface-mounted, so it would be difficult to get access to its tiny pins. I suppose that you could wire each row and column with a separate wire, but that would be a bit of work and you could make a mess.
If you want a mechanical keyboard with a programmable controller, I suggest that you switch to a Filco Majestouch or a Rosewill. On those keyboards the controller is on separate daughterboard, respectively and replacement controllers for them do exist which you could install relatively easily.