In sort a clear case of the grass is greener on the other side of the fence, the unit are simply identical.
No this is not a clear case of "the grass is greener" this is a clear case of "the ostheer commander has more ways to use a large amount of muni float."
I definitely agree that they worded what they said in a confusing way, but they're right.
Still, though, it's not like you NEED to use the munis on callins instead of mines, ZIS Barrage, molo, etc. Assault guards have a pretty expensive but useful nade, and the M4C has smoke barrage for muni.