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Some of the information is translated, but not all. Information such as net classes should be translated into DRC in order to create the same groups of nets in DRC, but the constraints associated with classes is not. Those constraint values might align with rule parameters in DRC or they might not. You need to determine appropriate parameter values for the rules that you run in DRC.
Differential pairs are defined by settings in the menu Setup > Options... (page) Differential pairs.