The first time I was sent a video (by a field researcher for WPT) of Timnehs in the wild I was amazed at how my own Timneh makes the same sounds. I really did think they were unique to my TAG's personality but it seems they are natural vocalizations. They make these forlorn sounding whistles and short tunes, and then there's the "Raaaaaa" (cute roar thing they do), almost like a little pirate saying, "Arrrr." Being physically smaller I'd bet their vocalizations do differ from that of the Congo. It's also likely that whatever sounds your Timneh is making are innate (that is if you didn't teach them or they are not mimicking something at home).