Supposedly, they are made on the same equip. The diff is the best inspectors check the the match primers, so they should be slightly higher quality. My take on primers; it can matter or not.As I suspected the only difference is the label .. When I think of match grade ammo I assume each charge of powder is exact . As for primers I expect them to put the same amount of care and quality in them all . But since their the same price I'll buy the match primers as long as their available
I work up a load with a given primer. Once the load is shooting well, I switch 2-3 diff primers, it often doesn't matter. Some rifles, some loads, there is a measurable diff in accuracy, but it's rare.
Btw, why are you buying mag primers? I will only use a mag primer if using slower powders & even then, in charge was above 45gr or so.