Yes, surely many of those styles would be duplicates or near-duplicates that simply have different file names. You'd want to play each one to see what genre it falls under, move it into an appropriate folder ("Country," "Rock," "Soul," "Gospel," "Traditional," or whatever), then use some sort of utility to compare them so you can remove any duplicates. And then you'd possibly need to use a utility to convert them from SFF2 to SFF1 (if you're using a model that can't use SFF2 styles), not to mention revoicing them to use your particular model's best-sounding voices, as well as tweaking the other settings as desired (Channel Volume, Pan, Reverb Type and Depth, Chorus Type and Depth, etc.). If there are some genres which you simply aren't interested in, you'd be lucky if 25% or less of the styles ended up being something you'd actually ever use.
In my opinion, it would be far better to buy the style collections that are sold here on the main site, because some of that work (removing duplicates and categorizing the styles) has already been done for you.