Yes, it is possible.
In the E-coder panel you can assign a button to switch between RX1 and RX2.
In E-coder panel click on a button, find VFO menu and enable "Switch receiver".
By pressing the button you will switch between RX1 and RX2
In addition to this you can logically switch each VFO A /VFO B in SDC TCI setup by enabeliing "Logical control E-coder VFO A/B"
Erik SM0JCA