no... threading is not barbs.
Barbs are completely sealed when the teeth bite into it.
Threading are not sealed, as they go around and then terminate at the way end, so in practice the water can work though the threading and then escape because there is no termination to it.
If you still want to try that route, then i recommend u teflon tape the threading like a mofo and then you clamp it down hard.
But i have had PEX fittings leak on me b4 because they too are threaded and not barb'd.