I understand they may all have a different internal capacity but if one is not a bench match shooter, does it really make a difference in a huntingor fun-target load?
If you bought the same brand brass today that you bought in 1995, there is no assurance they would weigh the same. And you can weigh the cases to determine if there is sufficient difference in internal volume (as defined by weight) that you need to adjust your loads.
Unless there is something vastly difference between the case weights, I would approach it the same as I do when I change lots of powder or bullet type of the same weight. Caution says to reduce your load from your established maximum and work back up.
But even if different "brand" cases weigh the same, I still segregate by lots as the brass life may be significantly different.