Hi Chandru,
As long as you have not used the XDAB device in your project file anywhere and the NION nX is loaded with the same I/O cards and CobraNet/Dante card, you will have no problems loading the file written for the NION n3 into a NION nX. For that matter, it will work in a NION nE as well, again as long as all the card I/O matches and no XDAB is used.
Likewise, you can take any project file written for a NION nE, nX, or n3 and deploy it to a NION n6 with no problem.
Josh Millward
Burnt Orange Studios