No, GOG provides the UK Fallout version 1.2 in both the Windows and DOS (Mac) varieties. You must be referencing the installer version for the Mac, which is just GOG's own version number. It is confusing, because GOG doesn't have the software version number up front, but both are running the latest official patches.
Actually, you need to go back and read the file that comes with the installer--whether the older version 220.127.116.11 which I downloaded when I first bought Fallout 1 from GoG or the current version 18.104.22.168. In BOTH files it states
"This version of Fallout incorporates all the fixes and changes from the 1.1 patch."
This means that we are BOTH wrong! I thought that GoG was supplying Fallout 1 v1.0.0 -- NO reference or confusion about the installers! You seem to get hung up on the installer version for some reason.
I realize that the Readme starts off by putting "Version 1.2" at the beginning of the file, but there IS NO version 1.2 that is Official that I have been able to find AND they later make the statement I quoted above that this IS Fallout with the v1.1 patch.
I do NOT understand why they changed the Fallout 1 installer version and there seems to be no explanation, that I can find, from GoG. If there IS an explanation, please cite the url location so that I and others can read it.