Apologies for the pretty poor description!
What I was getting at was if I brought a used key from fleabay, cut it open and took out the board could I then order a blank key + case, put the chip into it and get it cut and then program that chip to my car?
And if I can, does it matter about the Mhz of the new key? I.E. does it have to match my current key? If so is there a way to find out what mine is?