Off the top of my head: Yes, and no.
The target-number side of the task-resolution system is the same: skill + stat, multiplied by something based on difficulty.
The die-roll side is different: use d20 instead of d10, roll under the target number.
The only other changes I can recall between the two are some of the careers were modified, and the number of skills earned per non-first term is fixed.
I've been running for years with a v2.0 Big Yellow Book, the "v2.1" modifications that came with the referee's screen, and a photocopy of the altered careers, while at least one of my players had the v2.2 book, in case we needed it.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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