Pyramid Texts appears in Egyptian religion.
The Book of the Dead stands in lineage with the Old Kingdom Pyramid Texts as earlier royal funerary spell speech — named Pyramid Texts presence in egyptian-religion under this source’s historical frame, not a claim that BotD spells are identical to Unas.
from Raymond O. Faulkner (translation) · Book of the Dead, New Kingdom spells; Faulkner trans. 1972
appears in · sourced · culturally specific
Pyramid Texts is historically related to Book of the Dead.
The Old Kingdom Pyramid Texts stand earlier in the same royal-to-private funerary spell lineage that reaches the Book of the Dead — a named historical relation under BotD scholarship, not identity merge and not a PT→CT twin filed this run.
from Raymond O. Faulkner (translation) · Book of the Dead, New Kingdom spells; Faulkner trans. 1972
historically related to · sourced · documented