Ok so I am planning on switching from a 120rad to a 360rad and I do not currently have 6 identical fans. I can how ever use just 3 but I would like a push pull config. Can I just use 2 of the same fans with eachother even if the 3 sets differ from each other? Like 2x120MM 1200RPM fans on top, 2x120MM 1400RPM fans in middle and 2x120MM 2000RPM on bottom?