First, your Bruenn made 98 k was made in 41. Serial numbers were restarted at the beginning of each year. As for your metal parts, are the parts numbered to the gun? If so, keeping them together would be more valuable than great looks. As for the wood, it looks pretty well matched to me. It's not like they were making the handguards from the same chunk of wood like the rest. Finding a better matched one will require a lot of gun show trips.
Edit: Didn't realize that "not matched" is a euphemism for "doesn't fit"