1969 was a TOTAL OVERHAUL. The Lancaster template was a copy of the UK system. Complete with a governor-general appointed by Her Majesty. On Dec 12 1964 - Jamuri Day - Kenya scrapped vestiges of the queendom but PORK was still as accountable as PM, plus bicameral assembly and majimbo. 1969 scrapped all that - into imperial presidential, unicameral, unitary.
1969 - parliamentary federal to presidential unitary. Overhaul.
2010 - presidential unitary to presidential devolution. Small change.
You can google it.
https://en.m.wikipedia.org/wiki/Constitution_of_KenyaContrary to Tanga Tanga propaganda - the Bomas Draft was a thoroughly debated and consensual document. It was parliamentary with a ceremonial president, with 16 majimbo, some MMPR/party list. Yash Ghai, et al had brought folks together culminating into the national conference at Bomas. Ghai did a better job than Nzamba Kitonga and his Aukots. But then Kiraitu and Wako went to Kilifi and soiled it. Kilifi mongrel version was defeated in 2005 referendum.
2010 Naivasha was alot of ukora. PNU and ODM would outvote Babu team - then Abdikadir would lie to media that there was compromise or concensus.