The coin # doesn't change, but the description does, which changes the description when you look it up in the database even if the label says the other... welcome to MinTruth (Orwell's 1984)
Yes, it could mess up searches. However, if the descriptions become more accurate (after all, the "bronze" Korean coin variety does not have any tin in it, therefore it ISN'T bronze!), I think those kind of changes are fine. Well have to see though, right? If we notice that the photo of the Board of Directors of NGC has some "airbrushed gaps" in it, we'll know there's been a purge...
I agree IF they are actually checking the metal content and not just assigning them to each group based on "appearance". (And if they are checking the content I would like to see the actual percentages on the label. Because zinc volatilizes at so low a temperature it is difficult to create precise alloys. It's more of a target and you get a range of actual compositions with each melt.)
Got an answer from NGC: THEY ARE CHANGING THEIR DESCRIPTIONS OF VARIETIES! Check this out: __________________________________________________ Thank you for your email. I have been told, "We have changed how the designation will appear to using the percentages of metal on the coin. In order to receive the specific information, there is a VP charge to cover the cost of metal analysis." Please feel free to email or call us should you have any further questions. Thank you, Lisa Lisa Berzins Goolsby Customer Service | Numismatic Guaranty Corporation p. 800-642-2646 or 941-360-3990 x134 | f. 941-360-2553 NGCcoin.com