Two ways:
1) In your enforcement policy, add two rules with different group names:
Connection: NAD-IP-Address BELONGS_TO_GROUP <DEVICE-GROUP-NAME>
2) You can tie an enforcement profile to a device group and then add both enforcement profiles to the same rule. ClearPass will return the appropriate action based on the device.
So for example, in your pro curve profile, select the device group from the drop down on the first tab.</DEVICE-GROUP-NAME>