It doesn't follow from the fact that only two Dragons escaped the Fall of Angbad that they were Smaug and Scatha. The escapees may have been a mating pair, or they may subsequently have encountered, and mated with, other Dragons who had emerged from Angbad earlier. Either way, it is quite possible that Smaug and Scatha were their descendants.
Indeed, the quote which Squatter gave (which was the one which I had in mind) actively mitigates against Smaug being one of the Angbad escapees.
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Do you mind? I'm busy doing the fishstick. It's a very delicate state of mind!
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