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KaeYoss |

Is this a trick question?
Personally, I expect some general ruling about variant classes that say that Extra (any class feature) generally works for a modified class feature, but that you replace all mentions of the original class feature with that for extra class feature.
Either that or there will be variant feats.
Or they expect GMs to use their brains on this one. In case of PFS, I guess they'll add some rulings as appropriate (i.e. "Extra Rogue Talent can be used for ninja, but adds extra ninja talents instead").