Type 38 Safety Issue

[vintage hunter]

Did I not point this out in post #2? About the differences in safety knobs?

All you pointed out really was a misleading post on another forum and a link to an ebay auction for a book the guy used as referrence.
What the guy at gun boards is saying is there 3 different knob configurations and that they were made by at least 5 different arsenals to, I assume, inform the OP that if he's looking to keep his rifle "correct" type and manufacturer matter. Not once does he say the different types or arsenals are not interchangeable.
In fact post 22 above proves they are interchangeable.