We are using MK64FN1M0VMD12 in one of our design. We would like to upgrade to the K66 series. Not so much for the memory but for the speed as it is 50% faster and it also has crypto engine if in the future we need to secure the LAN communication. If we are to do this ideally it would have to be drop in replacement for hardware and code or I end up with different models that are not compatible. Can any one please confirm whether MK66FN2M0VMD18 can be used as a direct replacement in our case.