I'm beginning to wonder if I know what I'm talking about...altogether!
Are you absolutely certain they are not?
See this post (http://www.freerepublic.com/focus/news/2307402/posts?page=1744#1744) for the font or one similiar to it for the Kenyan cert. This font was the standard for typewriters from 1955 forward.
This one (http://www.freerepublic.com/focus/news/2307402/posts?page=1689#1689) showing the Office Memorandum AOE *COMPUTER FONT* is the font that the Australian one uses.
Note the open top 4 on the Australian one, the straight across 3 and the rest of the characters. I studied those fonts all last night and this morning and then went surfing for fonts and found that one Office Memorandum. Then spent a couple of hours comparing every letter and that was it. At least as far as I can tell. Let me know what you think!