Not specific to these two varieties, but in general thee are two things you need to watch out for. One is patent infringement and the second is trademark infringement. They are different. If a variety is under patent, you can not clone it through any method and sell it under any name without the patent holder getting paid through some sort of licensing agreement. Once you profit from something under patent, you violate the patent. For example Auburn patented the AU Buck III and IV Chinese chestnuts and licensed the patent to the Wildlife Group. I don't know if the licensing agreement is exclusive or non-exclusive, but a competitor can not come into the market place graft and sell AU Buck III or IV trees regardless of what they call them.
Trademark infringement is independent of patent law. One good example is Dunstan chestnuts. Years ago Mr. Dunstan held a patent on a specific cross of Chinese and American chestnuts. Until that patent ran out, you could not legally clone those trees and sell them under any name. In addition, Chestnut Hill trademarked the name Dunstan Chestnut. Now that the patent ran out, you can clone and sell those trees, but you can't sell them under the name Dunstan.
In general, with tree, the patent has been on the full combination of DNA. That meant you could use seeds and nuts from patented varieties to produce trees and would not be infringing on a patent since seedlings have a substantially and uniquely different combination of DNA. Recent GMO science has changed that. Here the patent is held on the specific gene or genetic sequence. For example you can not harvest RR soybean seed and sell it as seed without an agreement with Monsanto. The same potential exists for trees. There was a recent announcement of a GMO American chestnut that is blight resistant.
Good luck with your endeavor!
Thanks,
Jack