How close is the published The Silmarillion to JRRT's Silmarillion?

[Galin]

Originally Posted by jallanite

My apologies. I read your post and you seemed rather dubious about your information.

No apology necessary as I was just joking a bit there [thus the wink emoticon]; and yes I wasn't sure.

I note that Tolkien does not even mention Orodreth (or Orodreth’s daughter Finduilas) in Galadriel’s statement brought forth by mhagain. Presumably Orodreth has been forgotten by Tolkien accidentally or Orodreth is now considered to be a son of Finrod and so not mentioned by Galadriel in her utterance concerning her siblings.

Yep. In note 20 to The Elessar [mhagain's quote is from this text] CJRT also refers to this as noteworthy. Time-wise CJRT guesses The Elessar text was 'probably' written at the same time, or a little earlier than, Concerning Galadriel and Celeborn -- which according to Hammond and Scull, was itself 'perhaps' written at the end of the 1950s.

Not that you didn't know, but to try and note the relative dating of things.