NO, of course they don't. Alto Sax fingerings are similar to the other keys of saxes (baritone;soprano;tenor;etc.) and the recorder
Yes, the only thing different is that the A clarinet sounds a bit higher compared to the Bb clarinet Eric (Grade 8 clarinet player)
Yes, fingerings are the same. The Bass Clarinet will sound an octave lower in pitch. t
No. However the piccolo has the same fingerings as the flute.
Not exactly, bass clarinets have five keys at the bottom instead of four, but other than that I think it is the same.