What can I do with two Keylab's?

Hi,
I recently bought a Keylab 61 mk3 and, as my stage piano recently died, I also bought a Keylab 88 mk3.

I’m just wondering how I can maximise the midi controls across the two Keylabs?
I use both Ableton and Logic.
Perhaps one can be mixer specific while the other is device specific - what would you do?