Can I use an XW6848+ and an XW6048 in a dual setup?

Request:Customer has(1) XW6048 and is looking to install an additional inverter which would be the XW6848+

Solution:  This can be done, but they would have to downgrade the firmware on the XW6848+ to an XW6048 or
upgrade the XW6048 to XW+NA6848 firmware

NOTE:Please see attachment for details