One option you have is the use PC mapping. But that will be very limiting.
In this case, you put both devices on the same midi channel. You use the preset buttons matching the post preset number of the xt1 preset. Then you tell the Axe Fx to map that preset to the Axe Fx preset number you want.
For example, if you want to use xt1 preset #3 with Axe Fx preset #17 you would set Axe Fx PC Mapping from 3 to 17.
When the MFC sends PC #3, the xt1 will get 3 and change to it. The Axe Fx will get 3 and change to 17.