Welcome patrolsgtdan,
We don't own a Sydney, but I did a quick forum search & found only a couple of members who have that same model.
One of them posts fairly often, so hopefully he'll chime-in with an answer for you soon.
Not a specific answer to your A/C duct question, but it may offer some insight -- production changes are sometimes made mid-season and/or
near the end of a model year, so the RV's actual manufacture (born-on) date may determine what changes, if any, have been made.
Brochures are only printed once (sometimes twice) a year, so production changes may not necessarily be shown in the photos.
Have you searched online for interior photos (dealer ads) to compare any differences?
Good luck,
Terri, the Chevy co-pilot