The different firmware grades can be easily identified from under "Nearby devices" in the Casambi app.
For older "nRF51" units only the firmware version is displayed under the unit on the right side, for example "26.0". These can only use the Classic firmware grade.
For the newer "nRF52" units in addition to the firmware version, there's either 'Classic' or 'Evolution' text displayed next to the firmware version.
Only the devices with the newer "nRF52" chip will show the firmware grade/version (Classic/Evolution) in Casambi app.