I think that's the point we've been trying to make with the xy miking technique. The mikes are specifically placed in each other's field. To avoid this, use the ortf or nos, but people have been placing xy sets for decades. You are correct, but we're home recording enthusiasts, not a major sound laboratory or MIT.
Agree. This effect changes the sound. But if you do the same to two different mics, they will be affected the same. This point has also been made. Good point, but doesn't affect the test if both mikes are affected equally. There is no perfect test (observation theory). The best you can hope for is equal affectation. Like I said earlier, the best way to do the speaker test would be to assign one to the left of the cone, and the other equidistant from the center to the right of the cone. On a snare, however, taping them together is possibly the best solution, because however well you've tuned your snare, there are still sweet spots, sometimes within inches of other spots not so sweet...
Disagree. People have been cupping 58's and similar mikes since before Plant made it popular for the effect it gives. If you do it wrong, it sounds like crap, but there are those who can make anything sound musical
Bottom line: these two mikes do not sound similar. They aren't even close. No matter what the test, they won't. In a perfect environment with perfect test material, they will sound different. OP was to show that they shouldn't be compared as is often the case on the big, wide, wonderful web.