pohaku said:
Actually, I'd be surprised if they used the same capsule. They are physically so dissimilar that I doubt that the 431 capsule would fit in a 441 body -- too big I think. But I've been surprised before.
A google search of rec.audio.pro brings up comments like these...
Will Miho: "Speaking of Rob Thomas, he also sings into a 431 in one of his videos, which is basically the 441 in a handheld futuristic looking model..."
Wll again: "
The Sennheiser MD431 is a pretty good mic for snare, it's a great dynamic with the same capsule as the MD441. It's a hypercardiod too, the narrow pattern gives you good off axis rejection.
Scott Dorsey: "True, but also a substantially lower cost. With the 441, you are paying for some very extensive internal shockmounting and baffling which there is no space inside the more compact 431 for.
"The response on the 431 is close to that of the 441, though admittedly narrower due to the smaller grille, and the pattern is close too. It's not as clean a sound, but it's something like a third the price."
Scott again: "The 431 has about as tight a pattern as the 441, and about the same sound, but it's rigged up in a package that looks more like a normal PA mike than the 441, it costs about half what the 441 does, and it is harder to pop than the 441. I think the 441 is a little cleaner on the top, but the 431 is more useful on vocals because the 441 is so easy to pop.
JP Gerard: "I took a look inside and sure enough, the 431 assemly looks just like a 441 assembly."
There are dozens more, but you get the idea. It's not exactly authoritative, but if they're wrong, they're all wrong together <g>.