Theres a bit of difference in a "stereo set" as opposed to a 'matched pair'. I dont know what type of music you are recording and producing, but if its more to modern rock, pop, country, really anything with a large amount of drums and amplified instruments, a "stereo set" or 'matched pair' isnt really going to get you that much better of a recording. A good stereo pair is necessary for something like a recording of a stage ensemble, choir, or perhaps a solo piano recital where you arent close micing but are focusing on getting the sound of the space as well as the music and its effect on the space. In that case you are going to want mics with their specs within a very small tolerance of each other. This is simply to retain the balance of a stereo image. You wouldnt want one side or the other to have a different response or a different EQ curve.
It can be done...and it is every day, but the ease of matching two sides of a recording in a space becomes evident when the two sources are matched.
When you're tracking single instruments and close micing them, the matching can be a good thing, especially on acoustic instruments, but its not as necessary as recording a room. I actually like having unmatched pairs for acoustic guitar simply because I can tailor each mic to a certain position on the instrument by matching that mics' frequency responses to the instruments' tonalities. The same holds true for an acoustic piano.
That being said, a matched set of 414's can get a lot of use.