There should not be much difference. What is the DM02 firmware version? This is written on a label in the module
The label on DM02 says c017722, and there is another number on the board - PC01-042A.
Now the Status is that I connected the two keypads and changed setting in miscellaneous for doorbell response -67doorphonechime to make my keypads ring apart from phone (is that correct way ?)