Natively, Resolume doesn't support using the exact same MIDI controller twice. This is because it gets confused when two devices have the same name.
That doesn't mean it's impossible. You just need to rename the second device. Both Mac and PC have their own workaround for this.
For Windows:
Here you can find instruction on how to do this. Although it's shown in an older version, it works the same for windows 10.
On Mac: open up Audio MIDI Setup. Open the MIDI studio via "window" in the top menu. Now double click on the name of the device you want to change. type a new name and you're set.
Keep in mind that you will need to set the controllers to send different Midi commands as well!