NiLuJe puts a text file in the Kindle's jailbreak folder which says what version it is. My guess is you have .5.N if you installed it in February and you have FW 3.1. So no, unless I'm misunderstanding NiLuJe, because you've already got a jailbroken FW 3.1, you don't have to upgrade the jailbreak to put on FW 3.3.
-HM
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