You may be able to use a single buffer for both matrixes, that would probably work on your current hardware. Have not tried that with Adafruit's library, but I notice there is a .setPin() function to reassign the output pin for the LEDs.
You may be able to use a single buffer for both matrixes, that would probably work on your current hardware. Have not tried that with Adafruit's library, but I notice there is a .setPin() function to reassign the output pin for the LEDs.