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The older named powder don't change in their ballistics. each and every lot of a standard named powder is formulated to be exactly the same as the previous lot. Changing your brass and primers can change pressures more than using a newer made can of 4831 or anything else.
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As far as changing brass & primers go, I'll agree to that. Using a different primer can be as significant as adding another .5 gr of powder, which can be dangerous if you're building max loads.
As to one lot (can) of powder being exactly the same as the previous one, I'll disagree here. I used to use Hercules (Alliant) powders exclusively. When I used a new can of Blue Dot to work up some stout .41 Mag rounds I noticed they were a bit weaker than normal. I contacted Hercules who said they'd had one lot that ended up being improperly treated which caused the lower than normal performance. I did get a free can of Blue Dot from them though.