Welcome to Flyertalk Hanah.

Don't fly the route myself. There will probably be someone on this forum who can answer the question, but you could also try the QR forum, the below thread is focused on the refurbed A330 aircraft. The last post currently in that thread (post #195) indicates that horizontal lie-flat seats are used MAN-DOH, but not sure of the consistency.

http://www.flyertalk.com/forum/qatar...-seats-13.html