For public releases it is rare for there to be different build numbers for the same version number and so checking the build number would not normally be necessary.Out of genuine curiosity, what is the fascination with build numbers?
Betas on the other hand are different in this regard. For many years there would be a large number of build numbers associated with the same version number.
So it is quite common simply to check the build number to ascertain if a beta had been successfully installed.
Furthermore if you know anything about ipsw files, build numbers together with model identifiers help in ascertaining the correct one to download.
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