Does anyone know what the differences are, if any, in the Mandolin and Irish Bouzouki ??

Answer 1

One main difference is
Mandolin is smaller and has a shorter neck
Irish Bouzouki has longer neck and flat back

Both have 4 pairs of springs and are play chordal
for accompaniment usually!! They are very similar
mainly just that neck thing.
Now Greek Bouzoukis are different in that they have
either 3 or 4 pairs of strings and the longer neck, and usually
slightly more ornate.

Hope this helps!