For a famous speaker from South Africa, you could look up Nelson Mandela's speeches. One of his famous speeches is the "I Am Prepared to Die" speech, given during his trial in 1964. In this speech, he uses metaphors such as "the chains of oppression" and similes such as "like a colt unbroken" to describe the struggle against apartheid.
For a famous speaker from Papua New Guinea, you could look up the former Prime Minister Sir Michael Somare. In his speeches, he often used metaphors and similes to convey his message. For example, in a speech he gave in 2004, he used the metaphor of a "garden" to describe the diversity of cultures in Papua New Guinea.
Now, in terms of similarities and differences between the two famous speakers, both Mandela and Somare used figurative language to convey their messages. However, the context and content of their speeches were quite different. Mandela's speeches were often focused on the struggle against apartheid and promoting unity, while Somare's speeches were focused on promoting national identity and cultural diversity in Papua New Guinea.
In summary, both Mandela and Somare used metaphors and similes in their speeches, but the context and content of their speeches were different. Mandela's speeches focused on the struggle against apartheid and promoting unity, while Somare's speeches focused on promoting national identity and cultural diversity in Papua New Guinea.