Yes i loved the way you stated this ! good luck !
The heading<span> of a </span>business letter<span> should contain the return address (usually two or three lines) followed by a line with the date. The </span>heading<span> is indented to the middle of the page in the modified block and semi-block styles. It begins at the left margin in the block style.</span>
Answer
I think the main difference is that they are two different parts of Africa.
Explanation: