You say you want a "matched pair" of Marshall mics....
...like it makes one bit of difference whether they're a matched pair or not!!!!!!! You're lucky if you even get 2 Marshall mics coming out of QA that even look alike, much less worrying about the sound specs!!!!!!!!!!!!!!!!
If you're spending $5000 or more on a pair of mics, you need to worry about "matched pairs"...... if you're spending $200 on a pair, "matched pair" means they may have the same brand name, but that's about it!
Bruce