What is the difference between the BMC CDA'S meant for engines above 1.6l and those meant for engines below 1.6l? I had both. One from my 1.2 Punto and one from my 2.2 407. I have since given the one meant for engines smaller than 1.6l away but would now like to fit the other to my 1.4 16v? Is it safe to do so. When I compared the two CDA'S there appeared to be no difference at all. Is there or can I go ahead and fit it?