Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec So I pulled my engine

Measure the resistance of the old injectors and compare with the new injectors. If the values are really close then you should be ok.
Normally there are two types, low impedance and high-impedance. The low impedance draw more current and are likely to burn out the injector drivers in the pcm if the pcm was designed for high impedance. If the reverse is true, you would have high impedance injectors on a low-impedance pcm and your injectors may not fire correctly.
If they are in the 12-16 ohms range they are high impedance. If they are from around 2-5 ohms they are low impedance. Low impedance injectors were used in sets and fired in banks on older fuel injection systems. If one injector went bad on that system it affected the whole bank.