From what @cyclone3d says, I don't think it is an NEC SCU or bios - although the Zenith (actual) & NEC (broken) filenames don't match they would appear to be exactly the same files just named & packaged slightly differently, so I'd expect them to work no problem.
As far as I can tell, for the relatively short time these units were sold as NEC ProServa V+ instead of Zenith Z-Server WL, all NEC did was change the badge on the front of the case.
More generally with these types of system, what is important is that the SCU & bios are at the same release level, so we seem to have matched SCU & bios for v06 & v14 but no SCU for the vB08 which the boards shipped to @cyclone3d with.