To get the best performance the fans should match and should be matched to the radiator also*. You can use those two fans together especially if you have a manual fan controller which would allow control for best airflow. Even if you do not have fan control, it will still work but probably won't give best performance. If you do use differing fans (look more at FPM rating than RPM), use the less powerful one to push since it's easier to push than pull. I imagine a second intel fan would be optimal.
* radiators have different fin configurations and your fans should ideally be equal in static pressure and FPM, and then matched to your fins per inch count but that information is hard to find in print and usually ends up as trial and error. Also why I believe two intel fans would be best since the fan selection should have been optimized by intel (I would hope)