Your jumping the gun a bit saying its screwed. From memory looking at the picture you posted, it looks like a stock pulley. A bigger wheel is gonna be UNDER driven hence running lower boost (or are you talking about a crank pulley?). Keep in mind that they have electric lockup clutches that free wheel when no power is applied to them from the ECU.
SC14 is the same size except deeper (more distance to the rear from the pulley, about 62mm). So if it fits then yay for you but I think you'll find it will hit the engine mount or come very close. If an SC12 is running 10psi then an SC14 will be running 14.5psi (working on sea level and same inlet outlet temperatures for both superchargers and very rough calculations). As you over drive the SC14 the boost pressure is gonna rise somewhat exponentially compared to the SC12.