I figured I would update this thread.
I ended up using the 96-319 Oregon blade. They fit, but they had several differences. They were about 1/4 wider than the originals. They were flat across the width, while the originals were concave near the edge. They had about 1/8" less offset, which made them ride 1/8" higher into the deck than the originals.
So, they fit and they will work in my case. Your mileage may vary.
I can't comment on the performance compared to the originals, since the mower is brand new. The soil here is mostly sand and the high-lift blades wore out in no time on my Husqvarna (5 mowings), not to mention I want to blow around as little of that sand as possible. HTH