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1) They won't add your site to the new cat.
2) They'll add it regardless of the other listings.
3) They'll import your site to the third cat from one of the other cats that you're listed in.
It all depends on the editor.
I add sites to my category strictly on relevance and to some degree, quality.
If I think a site belongs in my category, I'll add it. I don't care where else it's already listed.
I've only actually imported (moved a site from one cat to mine) a site only once. And that was because it was no longer relevant to the cat it was in.
I don't know how much this helps, but I'm sure someone with more experience as an editor will probably respond as well.