Can I update the latest version of my 1.0 game to a UEFN version?

I converted one of my Creative maps to UEFN a while back, and then ended up deciding to go back to Creative for my map.
Now I kind of want to use UEFN again, but my problem is that I have updated my map a lot in Creative since the time I first wanted to use UEFN for my map, and none of the new map changes have carried over to UEFN and it is using a really old version of my map.
Any way to update the UEFN map to the latest Creative version?