In .45ACP at least, CCI and Speer are virtually identical and share a slight concavity on the base of the case, which indicates they are built to the same specs and possibly on the same equipment. Federal is different and has the customary flat base.
In 9mm, Blazer Brass also has the concavity mentioned above, but it is hard to notice. I don't have any Federal to compare but I'm going to stick my neck out and say it has a flat base like the .45.
They are all under the ATK umbrella but there are still two independent operations, CCI/Speer in Lewiston, ID, and Federal in Anoka, MN.