Thanael
Explorer
For Ancient History on these monsters check out: D&D Monster Origins
Yes, but was it the same monster?
Yes, indeed: the 1979 TD Barghest was essentially the same as the MM2 one.
It looks like my initial impressions were correct:
The Behir really hasn't ever mattered, but hasn't really ever changed either.
The Barghest is damn cool, has evolved slightly over time, and was focking butchered for the otherwise exemplary 4e Monster Manual 2.