A Swashbuckler continues to get level-based AC bonuses, a Kensai does not. Kensai get a -2 bonus and that's it.
If, however, they did continue to get AC bonuses, they would be granted only while the Kensai half was active. So, a Kensai->Mage would get the Kensai AC bonuses before he Dualed, a Mage->Kensai would get them during all the time after he Dualed.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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