Is there any mention of the extended conference room dialogue we saw only recently in any of the scripts?

Is there any script where Ben Kenobi does not die on the death star? This is an admitted change to the script by Lucus himself.

Could you actually link to some versions I did look at one version.

I think it is quite impossible to know you need original shooting script and shooting schedule and shooting script revisions. It would be quite complicated due to the various rewrites during shooting.