I may be mistaken, but I'm fairly sure that the Tie Avenger and the Tie Advanced are two separate ships. A Tie Advanced has 3 panel arcs at the end of the wings, which are flat in the front and the back. The Tie Avenger has points coming off of the front of the top and bottom panels of the wing, creating what almost appears to be a meat skewer on the front end of each wing. The Tie Advanced is very close to a Tie Interceptor with the small addition of a hyperdrive engine. The Tie Avenger does not contain hyperdrive.