I've loaded a lot with both, and even tested them without a powder charge to see if there was an audible, or any other noticable variation between them. For my test I used CCI LR BR and CCI LR and did observe a noticable difference. I tested at night using a 44 mag. case fired from a Super Black Hawk so I could easily hear, and or, see any difference, and I also tested in .270 win. cases fired from a 700 action. I was pretty amazed to find a shot to shot consistency that was audibly, and visibly, far more consistent, and seemingly more potent than standard primers.
Of course a more determining method would be to test them using equiptment that can precisely measure the elements of the detonation, thus providing a measurable comparision of heat and pressures produced from each component. But yes, I personally feel match grade or BR are not the same consistency.
GS