Um no.....as you can see there were/are many different camera models, although some of them have only slight variations in features like the M645, M645J and M645 1000s are all very similar with only slight differences in certain parts of their performance. You might be getting them confused with the RB/RZ67 series of camera, but I believe even these have gone through multiple versions with different features even if they have remained aesthetically very similar....