Correct, though they do not use the same devices. Cerberus pro panels use the product line with devices like the OP921. On the other hand, desigo panels use devices such as the FDO-421. they are different and incompatible (UL wise) like autocall and simplex devices. Also for other people who dont know much about siemens, their modular panels no matter if its an XLS, Desigo modular, or Cerberus pro modular, they all have a colour display.