Steve, the A320 and A32 share the same body style and tonewood combination. There are three main differences however and these are the same differences for all Avalon Legacy Premier range models and Avalon Legacy Standard range models. The Premier series guitars (the A320 in this case) are built with additional purflings and bindings. The second main difference is the selection of tonewoods; we select the highest grade tonewoods for the Premier guitars. Thirdly, the Premier series guitars have a 5-piece neck.
The Standard models (such as the A32) will not have purfling detail edging on the back and sides (only the soundboard); it will not have a bound fingerboard and the neck style is a 2-piece configuration. The build quality for both is identical however as is the standard of finishing. Tonally, they have the same character although the Premier model, because of the selection of the higher grade tonewood, will sound marginally better.
Hope this helps