Pretty much the same question, albeit with OZ and UA, led me to this forum first a few weeks ago. Here's a link to the thread:

http://www.flyertalk.com/forum/asian...tus-match.html

Although this is about a different operating airline, I suspect the answer should apply to your question as well. Judging by the replies I got, it's technically possible but the staff won't always get it right. But while extra luggage, early boarding etc. are tentative, lounge access shouldn't be an issue, so there's that at least.