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According to https://en.wikipedia.org/wiki/South_African_passport, There are six types of South African passports:
These passports are issued to citizens who are 16 years of age or older, and are intended for occasional travel, such as vacations and business trips. They contain 32 pages, and are valid for 10 years. Regular passports are not renewable – when they expire, new passport applications have to be filed.
Similar to regular passports, but contain 48 pages to cater for frequent travellers. Like regular passports, they are issued to citizens aged 16 and older, are valid for 10 years, and are non-renewable. like the regular passport when it expires,a new passport applications will have to be filed.
These passports are issued to citizens who are 15 years of age or younger. They are valid for 5 years, and are non-renewable
These passports are issued to officials attached to government institutions who have to travel on official business. They are valid for 5 years, and are issued to officials free of charge by the Department of Home Affairs.
Issued to diplomats and consuls for work-related travel, and to their accompanying dependants.
I am not sure what the difference is between the signatures in passports before and after 2009. It still contains a digital copy of the holder's signature. Countries are constantly looking for better ways to improve passports to prevent fraud so if there was a change, this would be one of the reasons.
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