I can only suggest you sell those SF2 WW C-boards because they are only good for SF2 WW as they are (i.e. 90632C-1 is only used on WW)
OR
just keep them as spare parts to save more WWs or just use their PPUs to repair more rare titles...
Other than that, they are what they are
cannot be re-programmed to anything else...
Not entirely true. Apocalypse can modify the program code of other games to work on whatever B and C board you have.
For example he made me ROMs for an original Final Fight on which the C had failed so it now runs a B-17 from a WW, but the original B board
He also made me a GnG that operates on B-17 so I converted a WW boardset
You just need to email him the information on what B and C board you have and what game you're trying to put on it, he'll do the rest