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Muttaburrasaurus vs Altirhinus

There are two Iguanodontia: Altirhinus from Mongolia and Muttaburrasaurus
from Australia.
These Iguanodontia lived approximatively in the same time, but it differs
from all other Iguanodontia in the possession of a large snout and a nasal
A similar characteristic may be evolved independantly for two time in
everyone of this Iguanodontia, or this characteristic evolved one time and
consequently this animals migrating from an emisphere to another?
And can the nasal bulla constitute an adaptation for the habits for
potentiated the olfactory sense?

Thank you in advanced and sorry for the English
Alessandro Marisa
Via A. Grandi n°18 ROVERETO (TN) ITALY
Tel: 039-0464-434658 Email: amaris@tin.it