How tough would it be to swap this controllers analog sticks into the DS3?

[Euphoria14]

No luck finding pictures of my Alienware Gamepad disassembled.

I want to know if the analog sticks will be 100% similar and that I can just do a quick easy swap. This pad works on PS2 and has the whole R3 L3 thing but I have this feeling that I will wind up opening them both up and realizing I need to do work just to get them to work.