I think there might be a difference between a document intended for external use in a treaty with another country and one that was for domestic use within the country (a country that planned to become a republic and was in the process of writing its constitution as such). Itranslate a lot of official documents and countries often refer to their very own agencies and government offices in several different ways in the same (official) document.
We won’t know until we see other birth certificates from that date, IMHO. Btw, the microfilmed Kenyan national archives are supposedly at the University of Syracuse (New York). I don’t know what years or why they’re there, but that’s what another posted said earlier in this thread.
Why not just give a call to the Mormon Geneaology people? Maybe they have a microfilm of all the birth records from everywhere.