Not really. Just speculation that isn't necessarily against plot facts (but if it were, these threads wouldn't have a reason to be). But then again, you could argue any number of things using the same watered down logic and making convenient interpretations of dialogues throughout both K1 and K2.
Was there an intention to have Kae and Kreia be one and the same? There's no way to know for sure, as there is nothing to suggest the opposite, and a negative can't be proven. But even if that was the case, the idea was probably dumped even before they began to script the dialogues. It would only make sense to have that revelation in one of the cut ending scenes. But the cut endings were left in, while any tangible evidence of this was not. Not to mention that this would only affect a male exile, meaning that female PCs would miss an important bit of information about the main baddy.
So yeah, it's speculation. And rather baseless at that.