Is that something I could check? Here (with the experimental XPI) ${GeckoChangeset} is identical with ${PlatformChangeset} but IIUC lines (new) 33-34 above it is an artefact of them being got from the same source.

SeaMonkey uses six repositories, as follows (for trunk, and relative to the top directory of the comm-central clone):
<ul><li><b>./</b> from <b>http://hg.mozilla.org/comm-central/</b></li>
<li><b>./mozilla</b> from <b>http://hg.mozilla.org/mozilla-central/</b></li>
<li><b>./mozilla/extensions/irc</b> from <b>http://hg.mozilla.org/chatzilla/</b></li>
<li><b>./mozilla/extensions/inspector</b> from <b>http://hg.mozilla.org/dom-inspector/</b></li>
<li><b>./ldap/sdks</b> from <b>http://hg.mozilla.org/projects/ldap-sdks/</b></li>
<li><b>./mozilla/extensions/venkman</b> from <b>http://hg.mozilla.org/venkman/</b></li></ul>
Similarly with slightly different first two URLs for aurora, beta, etc.<br>Or did you have something else in mind?