Commenting on the textual character of P13 (c. 225-250) and its relationship to P46 (mid-second century):
P13 and P46 display 80 percent agreement. (Philip
Wesley Comfort and David P. Barrett, The Text of the Earliest New Testament Greek
Manuscripts, 2 vols. [3d ed; Grand Rapids, Mich.: Kregel Academic, 2019],
1:70)
Commenting
on the textual character of P75 (middle to late-second century) and Codex
Vaticanus (c. 325-350):
It is a well-known fact that the text produced by the
scribe of P75 is very accurate. It is also well-known that the text of P75 was
of the sort used in formulating Codex Vaticanus: the texts of P75 and B are
remarkably similar, demonstrating about 85% agreement. (Philip Wesley Comfort, The
Text of the Earliest New Testament Greek Manuscripts, 2 vols. [3d ed; Grand
Rapids, Mich.: Kregel Academic, 2019], 2:13)