Quote From the FM Wiki:
The basic LCD display for a Midibox project is a 2×16 character LCD based on the HD44780 industrial standard from Hitachi. You can use a larger LCD, like 2×20 or 4×20, and the standard Midibox projects will just use the 2×16 characters in the top left corner.
So yes the MBFM can use both displays in the group buy, check your built
Updated list
40x2 display
Me: 3
arumblak: 5 white
synapthec: 2 green
Blatboy: 3
Echopraxia: 3
Altitude: 2 green
Total: 18
20x4 Red display
Me: 1
synapthec: 1
Altitude: 1
arumblak: 1
Total : 4