That's like asking if I can upgrade Windows or should I format and clean install.
While the technically correct answer would be to wipe and install (thereby eliminating any problematic apps that may not work with the new ROM that worked perfectly fine with the old ROM - for example, I have 161 apps installed - trying to figure out which one is all of a sudden causing home to FC after upgrading a ROM is going to be a major PITA, much more so than wiping and then installing my apps one at a time and testing compatibility....
The answer *I* am gonna give is that, IMO, since the ROM is by the same person in hte same style (IOW, and incremental update to the ROM you now have installed) more than likely it should be OK to update.
As always, though, YMMV, and Use at your own risk.