I have two tackle shops which are not the greatest for gear, but both do a rod repair service - one in house and one sent out...
I'm not saying you haven't done your homework ( and you may have a very good local repair shop ) but when I asked one of them to replace a broken ring they said they would 'match' as close as possible.
Being very fussy by nature I wanted the identical ring so I contacted Drennan ( in my case ) and they sent the identical ring which the shop then fixed, and very well indeed !
Yes, a 'close as possible ' ring is absolutely fine BUT when I had mine fixed I made absolutely sure they would do such good matching job with the whippings etc that I would not be able to see the difference - I wanted it dead right and they promised perfection..............It worked for me !!
Not everyone is so fussy though AND I have seen some dreadful 'perfect' repairs in my time so it pays to check !
ps If you're not sure, you could always ask to see the replacement ??
Apologies if this sounds a bit' teaching grandmother' etc etc