Maybe, but two oils from the same guy can be very different.
Jinkoh store is run by Marius, who is another owner of Imperial Oud. His Grand Emperor Nha Trang oil smells very different from Nha Trang Ultima.
Sulaym is also run by a former part-owner of IO, and their SQ Vietnamese oil smells nothing like any of the oils mentioned. They haven't released any kind of new gen Nha Trang oil that I am aware of.
That is because these people have lots of connections and they get their oils from different sources. Marius got his NT oil from a chinese seller and Sulaym's viet oil is an SQ oil, so obviously different. According to rumors, Ensar got NTLTD from the same distiller that the guys at IO got NTU. If NT ko or Oritsu is from the same source then it probably smells similar, but if it's not then it probably smells very different.