Bush Artillery Library Convention

[triangular_cube]

I've been planning out how to best wrap my Afrika Korps playthrough, and I've noticed in our Library we don't seem to have a consistent convention for how to treat the Bush Artillery. In some scenarios where they are called for, the Library lists an Italian piece, in others it lists an Australian piece 

Neither is "wrong" but do we have any interest in determining which is "more correct"? Ideally these would be treated uniformly throughout the library.