G'day apophenia
As far as I'm aware mate, they are two completely different designs. I personally always knew the Agusta LBH as the A129 LBH, but more recently I was made to believe that it's designation was A139 LBH - hence the confusion with the A139 LUH you refer to!
I have a neat profile of the A129 LBH/A139 LBH, but can't post because of its size, but will have a gI tonight in reducing and posting.
M.A.D