The ntp4/ntp-4.2 one was updated in mid-March at the same time as p14 was created.
Looks like someone messed up creating the releases.
EDIT: Looking at the p13 -> p14 diffs they are almost all version-stamp related.
So it looks like someone pushed all of the updates in and created a new p13 package, then realized that the version should have been updated, updated it (along with a few minor changes, which might have been what triggered noticing the version needed to change) then created a new p14. There's just over 1 hour between the production times.
So the ntp*.bb build file should be changed to refer to the file one level up....
EDIT2:
But there's little point in submitting it as a fix to github, as the latest version on github refers to the p15 file.