I am not fan of the making cross reference chart or map. Reasons are many. Main reason that time has been rapidly changed since first color chart with aircraft color was released for the public and market. In this moment we living in the communication and technological progressive world and all of this benefit could used here.
About the same chip- everybody who have chip for sure have PC or Mac and scanner. Why he or she should waste time with hunting for the reference map as well he can simply scan the color relic he had and get almost perfect match of this color which could be present to the public. Via internet or so...
Other solution is if he want to make printed sample. And the answer is in the modern automotive paint studios. They have computer machine who can scan color and mix identical paint. That was made not for the airplanes fan but to solve one critical problem with cars- scratch repair. problem is that when small scratch is occurred you should paint all the area. That was because color of your car is not the same as the factory. It is fade and changed. And that was expensive. With computer mixing you get small amount of paint identical to the paint of car. Millions of color can be mixed. So every relic owner could go to the workshop like this, give it material for scan and minute later get small can of color he want.
All above mention solution give fast, cheap and very precise match of the relic color- either digital or paint version