This is how you figure out what is different between the two versions. By doing this you can see which 2 ROMs you have to swap out. Luckily on this game board they are the socketed ones and not the surface mount ones!
Go to Google and find ncv1.zip to find the US version of the ROMs for download.
Keep in mind that some sets will NOT have all the files! The way MAME works is you have a parent set then all the child sets just have the different ROMs ONLY and require the parent set for the rest of the ROM files.