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You know what, I'm inclined to say that whatever that is, it's a different thing (either that be a previous tech demo, CCA derivative, whatever) that this:
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Tailsting/nozzles don't match up + a number of other differences. I'm suspecting the one captured in video is a tech demo, an early one at that.
Both aircrafts (assume that they are entirely separate airframes) do have their respective video. Are you referring to the one from December or the one posted today?