From Zhou Xuan's current perspective, the Ancient Tattoo Clan's tattoos and his tattoos are completely different categories.
It's somewhat akin to "Dragon Seeking," which divides into perception and acupoint, and the Bone Elder Association, which separates pain and prayer.
The most compelling evidence lies in the tattoo patterns of Peng Long and Peng Hu, which were never taught by the Blood Tree.
The Blood Tree had already taught Zhou Xuan six incenses worth of tattoo maps, but Peng Long and Peng Hu's tattoos had not appeared.
Either Peng Long and Peng Hu's cultivation level has already surpassed six incenses, and their tattoo maps come later in the sequence—which Zhou Xuan has not yet learned given his current progress—or the tattoos of the Ancient Clan and the Tree Clan have already diverged into two distinct streams, with vastly different tattoo maps.
