On Catalina (v10.15.7)…
- the build version of Safari 14.0.3 (before the 14.1 update) was 15610.4.3.1.7
- the build version of Safari 14.1 (buggy update, released Apr 26th) was 15611.1.21.161.5
- the build version of Safari 14.1 (corrected update, released May 4th) is 15611.1.21.161.7
On Mojave, the build numbers for Safari 14.1 are the same as above, except that they begin with
14 rather than
15.
Detailed info about the security content of each of the two Safari 14.1 updates is available at the following links:
Note that the description of the latter says that it "includes the security content of" the former.
More info about this issue is available in the content and comments of the post "
Apple has pulled Safari 14.1 update for Mojave and Catalina" at Howard Oakley's wonderful Mac tech blog,
The Eclectic Light Company.