from what I was told...the only difference between a federal "match" primer and a standard primer are the color of the box, and that a "senior" inspector looks at them before being packaged.
I was also told that when demand is super high, as it has been for awhile, they don't produce nearly as much "match" grade primers as the standard to try to keep up with demand.
but that's just what I was told so take it with a grain of salt. that being said, I do purchase the match grade when I can, but I will buy standard if need to