I ordered one (in silver, no less)
They are the same shape and almost the same length, but the marching baritone mouthpipe is roughly an eighth of an inch narrower from end to end throughout the taper.
Thank goodness I'm fast, experienced, it only took me about a half an hour to open up this baritone mouth pipe to a euphonium mouth pipe, and I didn't fold or bend it, but it was annoying. Had I known, I could have ordered the raw brass one and it would have looked better. That said, I probably would have just made one from scratch.
Anyway, they handed it to me on VERY short notice, and I had it back to them last night for their contest today.
I'm not a fabricator, but I can do some stuff. Just think of all the people who can only un-solder things and solder on other things, and then think about what's going to happen to most of the American-made instruments in a very short amount of time.
I also knocked out all the dents and creases and shined up some really easy areas to shine up, but I told them that I wasn't going to shine up the whole thing, as that's up to their students.
edit:
It was the Bands of America regional. This school came in second, 100 points fewer than some band out of Texas. I doubt it did Texas band was actually better... most likely just different. Had my high school band been as good as this one, I probably would have been actually interested in marching. You should hear their intonation.