[Trombone-l] Baritone question

[horns@easeandluxury.com]

I apologize for a non-trombone post, but I thought there might be
enough crossover that people on the list might have answers (and
haven't found a better forum).

1) Is the fingering for the marching baritone the same as for the
regular baritone? As seen here:
http://www.veritas-online.com/edarchive/Euphonium.pdf (e.g., the Bb at 
the bottom of the bass clef is open)

2) I've seen differing statements about mouthpiece sizes. Do baritones
(either sort) use small-shank mouthpieces, such as 12C?
If so, then it would be interchangable with trombone?

Thanks!