I don't think the fan clips on the XP-90 will work with that adapter. It doesn't look like it has anything for the clips to hold on to. You might be able to rig something up that would work, but the stability of the whole thing would probably be pretty questionable. Not to mention the fact that the extra 27mm spacing of the adaptor, and the extra weight of both it and the larger fan would apply more torque to the motherboard, which isn't so good.
Why do you want a 120mm fan anyways? I can't imagine that there would be a huge performance/noise benefit over a good 92mm fan.