Them thar shell casings just aint that damn expensive!
I wouldn't use them unless the head stamp matches the load.
Brass is just not so expensive that you need to risk confusing loads.
And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.