Yes its all the same head stamp. Its all Federal.
I have kept all my brass separated per manufacture.
I took several fired rounds and measured the headspace at 1.626-1.627.
If I use the SAMMI spec of no more than .007 difference then the lowest headspace would be around the 1.619- 1.620 mark
My thinking may be off, but then for my brass that's under .001-.005 should be ok to load.