Two words: calibrated sets
What the product page doesn't make clear is that the listed specs are for the bridge pickup only. Each neck pickup is a different pickup wound specifically for the neck position (i.e. it's not just the same pickup turned around). For example, the Cold Sweat bridge is 14k with a Ceramic magnet, but the neck is 8.2k with Alnico 5 magnet.
IMO, you should seriously consider calibrated sets before trying to mix'n'match different models that may not balance well together. That's not to say that you can't or shouldn't have 3 different pickups in the same guitar, just be aware that the corresponding bridge/neck models might get you want you want anyway...
Also, what sounds do you want to achieve from your bridge & neck pickups?
