Your CX Gold will get you into J lounges when flying OneWorld flights (or thereabouts), while your Qantas Club membership will only help with Qantas and certain partners flights (AA, US, EK I think). Ideally you should just credit to one program, and you might get to that next level. Your CX Gold membership will work for Qantas flights for example. But your Qantas Club membership wont work for CX flights.