Hello, it is possible as long as the Echelon is running a 3.x software version.
If the console is running 2.x software, it may still be possible, but when saving the show in Hog 2 PC, you will need to go to the Change Show window and select SAVE AS Version 2 (32).
Actually I'm not able to find out the software version of the console. But I can tell you, that the desk could load the modified show without any problems. I did the modifications with hog2pc 3.4.2.62.