A distribution so widely used as this one eventually develops numerous barnacles as the result of porting to new systems, idiosyncratic new features and just plain bugs. In order to help keep order and make maintenance bearable, we ask that proposed changes to the distribution be submitted in the following form.
patch -p <your_patch>
Prior to ntp3-5.83 (releases up to and including ntp3.5f) a complete patch history back to the dark ages was kept in the ./patches directory, which might have been helpful to see if the same problem occured in another port, etc. Patches were saved in that directory with file name in the form patch.nnn, where nnn was approaching 200. All patches in that directory have been made; so, if yours was there, it was in the distribution.
Since we have been getting multple patches for some bugs, plus many changes are implemented locally, no two maintainers here use the same tools, and since we're not using any bug-tracking software or even source code control, there is currently no tracking of specific changes.
The best way to see what's changed between two distributions is to run a diff against them.
Thanks for your contribution and happy chime.