Chipster: The critical rebuild was released by Bioware AFTER it's last patch, v1.69, to correct some of the graphics issues owners of the newer cards/drivers (at that time) were having (and some peripheral adjustments). With the advent of CC tilesets, newer animations and the shader, it becomes more important to run the CR. GoG's version applies only the v1.69 patch.
I don't believe that is what happened.
AFAIK, no one has ever shown their is even one byte of difference between an English GOG install before/after the Critical Rebuild patch.
Also, Foreign language versions is are still version 1.68.
From what I remember. 1.69
is the critical rebuild patch. They are one in the same.
But only the English version of 1.69 achieved full QA, and was production certified before funding was cut. All the foreign Language versions were deemed beta. So that is likely why they were not included in the final NWN package sent to distributors like GOG.
Anyone running a Foreign language version of NWN1 should get the patch and apply it. Bringing their game up to 1.69.
It is optional on the English language version, but should be harmless if you want to do it anyway.