The lineage of the Catahoullas is "varied", depending on the source.
The catahoulla is a "leopard catahoulla cur" , the Leopard cur is a Cur crossed with treeing hound, years back.
They are different "breeds" "Maybe"
I know guys will tell me "Thats not right", it may not be, but the records of the early "Cur" breeds are very vague.
There are a few good books on the subject, if you want to make up your own mind about the history.
My experience with "Curs", has been close range,(till game is jumped, then they won't quit) and silent on track. Mine only "open" when they see game. Also mostly med to hot nose.
Hope this helps.